2. You're also trying to sabotage change within yourself by saying "oh, but it'll take so long/be so expensive". You were not done the moment you left school. That's a common belief that is imposed upon young people, but carried to its conclusion, it's rather ugly and implies that you're either a huge success or eternally damned at age 30, and all events after that point are handwaved away in a Logan's Run fashion. 30 is more commonly a point where people in our society start to get a sense of their actual career path and shift from "consumers" of the current culture to "architects" of the next culture; what preceded that was mostly performative in the average case, a demonstrative adulting to "make the grade", and employment as a footsoldier for this or that ideology. You are cynical about this behavior already(hence your low opinion of the FAANG stereotype). It is therefore time to let go of youthful impulses and seek reflection.
3. This is the point where you should go study the extracurriculars you bypassed the first time because they weren't "practical". You can limit it to one a semester, night classes, online classes. You don't have to rush into a new degree. Through works of art, studied or improvised performance, sporting achievements, philosophising and general appreciation of the human condition, you can loosen the grip on things you have come to hate and start taking some new ones. The arts never have to become your profession, but they will let you see yourself better.