If work is boring, and different kind of jobs don't help, find something besides work: go running, go dancing, go do a theatre course, singing. I tried all kind of things and am open to try anything that seems interesting. I dance a lot, weekly, and it made my life a lot better. I don't say dancing is for you, but whatever you do, it should be fun, something to look forward to.
Maybe singing, dancing and theatre don't appeal to you. It didn't appeal to me, I thought I couldn't do that, that it was difficult. I'm a typical introvert, not artistic or creative, prefer to stay in the background, but all these things were a lot more fun than I ever had thought and I discovered a whole new life.
Don't try them all at once, start with one, give it a good chance, and don't give up if the first course isn't what you hoped for. Try another teacher or school, a different group. All these things come in many varieties and it can be a challenge to find what works for you. Each experience brings you closer to what you want, teaches you something. If you're afraid about something, that is especially interesting.
This didn't make my work better, but it made my life better. And it opens perspectives to new areas, possibly for work. Not that I want to be a dance teacher, but having a new look on life can change work as well.
Personally, I find my day job technically challenging, fun, and often rewarding, but I don't really find it fulfilling in some deep meaningful sense. I feel useful but not meaningful.
It took me a while to realize that this was the problem I was having -- and that just switching from software engineering job to software engineering job wasn't going to change it -- and I am still at a crossroads as to what to do about it. I'm not sure if I should seek fulfillment from outside my career -- family, community, a craft, a cause -- or if I should change my career to one I (think I might) find more fulfilling.
From personal experience, if you're the kind of person who tends to be more invested at work (seeks out challenges, takes pride in your work, feels pleasure at a job well done), I'd hazard you might not be happy doing work you don't find at least somewhat fulfilling.
My thought process being that personal_investment_in_work + fulfillment_only_outside_of_work = eventually resenting time spent at work as unfulfilling.
Everyone can't work on cancer-curing, economy-stabilizing, poverty-eliminating, food-scarcity-solving, gender-equalizing, minority-protecting, free-speech-supporting things.
But we can at least move a little closer to working on something about which we can honestly say "Yeah, that does make the world a slightly better place."
On the other hand, at the moment I'm still young enough to start a second career -- it wouldn't be completely crazy for me to go back to school, learn a completely new skill set, grind up through the ranks, and try to have an impact in some other field.
On the gripping hand, I'm not so young as to be in an impatient rush about everything. I don't need to completely upset my entire life just yet. So I'm carefully researching alternate careers to decide if I'd actually find them fulfilling and have an aptitude for them (it'd be a shame to spend ten years and realize I'm not fulfilled by my second career either). And I'm trying to expand myself a little bit more outside my day job, so that my happiness doesn't rest on a one-legged stool.
Perhaps it could be if you have supported yourself with a draining, minimum wage job, and a 2nd one in the evenings, struggling to pay rent, then your tolerance for computer work may be much higher? Whenever I get tired, I just have to remember back to my days of slinging cheeseburgers and I feel content with my current situation.
It happens to me for most other hobbies as well. I enjoy working out a lot, but there are times where I just don't feel super excited about it, for like lets say a month or so, and I have to put in a lot of will-power to get to the gym. So I do basically what you do here as well, try different kind of workouts, etc., with varying results and that helps sometimes.
I think at the end of the day it's really hard to maintain that level of passion for something that you do day in day out. You just have to accept the downtime and know that it will pass in a bit. At least that's my take on it.
Edit: right after I posted I was reminded of a quote lifters use often: "motivation gets you in the gym, as it's fleeting, but discipline keeps you coming back". I think the same applies here, to some extent.
Just a theory.
Personally, I get bored with my current "life" from a given point in time, and need to radically change an aspect of it to add that excitement and focus back to it. Doesn't always go as planned though.
But as you get older, I find people in general get tired of the same bullshit that keeps popping up at job after job, and that almost never goes away.
Personally, I bought a camper that I leave parked at a local campground that is within an hour from home. I'll sometimes take off early on Friday and head up there for the weekend, other times I'll take a week off work. But my favorite is to take a 2 week vacation to someplace with an ocean and beach, and spend quite a bit of time either in the water or just laying on the beach listening to the waves.
But the best cure for burnout that I had was when I had a job that was regular 40 hours, that I got laid off from (6 years ago during the height of the last recession). Spent 4 months in the summer with only a couple interviews, but then when I started my new job I was totally refreshed again. It's only been in the last year that I've started feeling bored/tired again, so maybe it's time for another layoff.
It's easy to stop caring about something when its not really worth caring about.
However, I recently went through a period of anhedonia (https://en.wikipedia.org/wiki/Anhedonia), which may be what OP is experiencing.
Things that I found that worked: exercise for pleasure (riding my bike!). Connecting with people (one-on-one -- i'd always been part of a big group before). Learning new things, new challenges. Yoga.
A book that helped me a lot was Frankl's "A man's search for meaning". I realized that I had a bit of fight club nihilism in me because I never chose my purpose in life, and so was just sitting on the metaphorical treadmill of existentialistic wallowing.
Another thing to consider is that the problem might not be you, it might be that the situation sucks.
(Edit: Apparently Gibson attributes it to someone else he retweeted, but the internet is unclear on where exactly it came from)
If it was just work, I'd say it was certainly just burnout. However, when its pretty much your whole life [it sounds like], it could be depression.
I'm always motivated to do at least a good chunk of my "after work" activities, every week. But yeah, work, ehhhhhhh I'm just not happy unless I'm working on something I'm proud of and that comes along maybe once every 18 months.
But being bored at work can lead to feelings of depression if you feel like you aren't really accomplishing anything.
It needn't be a home hobby, it might be reading, it might be an activity-club that you enjoy, it might be volunteering - but I've found that I need things outside of work, even work I enjoy, or life's pretty cruddy.
Similarly the stresses of work can really build up, even if the work's quite interesting. There's no amount of money I could be paid to work in a continual six month lump again. That's the sort of thing where you take a holiday and spend the first few days of it just decompressing; eating icecream, sleeping, and reading or watching TV or the like.