Have you considered getting into art? I find art projects to be big motivator and fills me with ambition. The great thing is I do it for myself so I can feel content knowing I don't need to fulfill the needs of an audience. You can be ambitious as you want. Making concrete sculptures, woodworking,oil painting, restoring old furniture, developing a game (physical or digital), writing short stories, researching and writing a book or zine on a random niche subject. I find that making art fills that hole that exists when I'm not doing much in life.
I tried getting into some forms of art (mostly drawing) many times, but in the end I always find it contrived and pointless. Basically a more taxing version of playing bingo to pass the time.
