The paycheck is pretty much all that is getting me out of bed in the morning, even if at this point I can't say I really need it anymore.
I mean also maybe not, but I find it hard to devote time to things I know I am interested in because I work 9-5, 5 days a week. I spend time with my partner of an evening and have housework and exercise to take care of and after all that it feels like there is very little time and like I don't have a lot of energy to learn new skills or pursue hobbies, so what I end up doing is the things I know I like but that are not draining. Ultimately I spend a lot of time reading or playing video games or goofing off on reddit.
Even taking a week or two off isn't necessarily a good indicator, because you won't say, go and buy a bunch of paints and an easel and go "right I'm finally going to get stuck into painting" when you only have two weeks off and know you won't have time for it once they are up
People absolutely fall in and out of interest in different types of activities. This is especially true of people who really jump into things with both feet.