Go travel, visit some friends overnight, go camping, anything to get out of the house and create new (or at least different) experiences and a bunch of simple-but-different problems you need to solve. When you're done and get back home, you can reintegrate to the Internet, catch up, and hopefully not feel too guilty about it. Spend your willpower making sure you get back out there, rather than trying to police your default behavior.
If that's not possible to due a lack of money, friends, physical ability, etc, then I'd say you are dealing with serious depression and professional help is not unwarranted.
I feel compelled to also add that while it seems well-meant, I think the tone of your last paragraph is a bit unproductive. A lot (most? all?) of us, at some point, fall out of the habit of exercising our senses of curiosity and wonder and trying new things. This can be caused by many combinations of family, economic, and social conditions, or for some, because of chemistry (ie “serious depression”). Therapy is indeed a good way to develop the skills to work against this and identify whether it’s actually a chemical problem in need of a chemical solution. But it doesn’t help to go straight to calling this “serious depression” needing “professional help.” Literally all of us can benefit from therapy, and making it out to be a big deal and putting labels on people makes many less likely to pursue it.
Internal and external factors tend to pile up and reinforce one another, and if someone is at a point where those external factors are contributing to not being able to try changing patterns of behavior, that would be seem to be indicative of a problem that should be acknowledged.
It feels like I'm coming from a place that is the dual of your comment - even though everyone could theoretically benefit from therapy, people are not going to seek it out and add even more complexity to their lives unless they feel they need to - especially with the care-denying medical bureaucracy that permeates the US and apparently Canada. Acknowledging a problem is a first step to addressing it with an appropriate tool rather than normalization and coping band aids.
If you went to a doctor for type 2 diabetes, they would tell you to eat healthier and exercise as well as to take medications when needed. Your eating and activity habits are not themselves diabetes, even though they contribute directly to your diabetes. Another person could act exactly the same but not trigger diabetes because of lower genetic predisposition. And another person could have a healthier lifestyle than you and have diabetes despite that (e.g. Type 1). Lifestyle is a contributor while diabetes is the pathology.
Life circumstances can be a contributor, but depression is a pathology. An effective healthcare team will treat both.