I understand that a job gets boring and you have to do things you wouldn't choose to do yourself for decades on end, but that's what a job is.
And as a developers, we're pretty lucky that we're generally respected within our companies, well paid, have plenty of work/life flexibility, and have the ability to go solo and do our own thing on our own terms - all within what is mostly a meritocracy in that talent often trumps pedigree.
I make a living running a company that I bootstrapped 5 years ago. It was fun when I started, but I do find plenty of days where I'm feeling burnt out or uninterested. I'm reasonably certain that no matter what you're doing - if you do it long enough, you'll find things you don't like about it.
My only tip for anyone feeling this way is to look for microchallenges. If you're basically just fixing bugs in an established enterprise product, for example, find clever ways to improve the code, refactor code, make debugging easier, improve system stability and monitoring, etc. Perhaps find something that you could parlay into an open source project. There are plenty of fun little challenges that can align your personal and work life if you look for them.