I have an advice for you.

1. Go and build a telescope - https://stellafane.org/tm/atm/

It involves manual labor and thinking as well. Grind that mirror. Make sure you finish it and then go out and see the stars.

2. At your job do absolute minimum and go home as soon as it's possible.

3. Go out and do some charity work. By doing it you're not only helping others but helping yourself as well to feel better. It's kind of an egoistic thing as well but who cares.