Ask HN: Options for critical thinking and learning outside work?

What options in today’s world exist to support critical thinking? I’m at FAANG basically trying to stay afloat as an expat in a foreign country and hate my job. Mostly forced to do AI LLM stuff. Security and quality out the window since management stopped caring about that.

I miss deep thinking and training my brain. Should I pursue a masters in math or something? I have a masters in general CS, but this was 10 years ago.