Should I quit my job?

I work making a 6-figure salary at a large tech company. I'm considering leaving my job- I'm doing well here, but I'd like to move on and try new opportunities. The thing is I don't have anything in particular lined up; I was basically thinking I would mess around for six months or so. I have a few things I'd like to get into:

• Getting more into Ethereum development. I've been helping out with a small Ethereum project and enjoying it, I'd like to explore this some more.
• Learn Russian; I've been trying to learn to speak Russian but it's difficult to do with a full time job. I think I could make a lot of progress by devoting 10-20 hours a week to this.
• Generally decompressing from a stressful job. I share an on-call rotation, and even outside of the oncall there are often pressing production issues to deal with.

On the other hand, there are good reasons to stay at my job:

• I make a lot of money. (My partner's job can get me covered for healthcare, though.)
• I'm being encouraged to work towards a promotion. Within 1-2 years I believe I could reach the role of Senior Software Developer.

Should I quit my job, work on random things online, then get another real job later this year? Or should I stick with what I have now?

(Quorum is set to 0.70 kiancoin; if less than 70% of kiancoin participates in this poll, the decision is nonbinding.)