[brundolf]

It seems like your main problem is boredom; so I would say, try out some new kinds of projects/languages in your spare time and see what you like. You mentioned machine-learning, maybe also consider trying out:

- Back-end web

- Graphics programming

- Native apps

- Game programming

- Systems programming

- Embedded

- Parsers/compilers

I've gotten into a couple of these in my spare time and enjoyed the change of pace from my day job. If you find one you really love, and you feel like doing it as a hobby isn't enough, then you'll have more confidence deciding to take a career leap