First, invest in the platform for your life – your body. While your depression may never return, no one can rule out a physical component. You’re more likely to find life rewarding if you take care of yourself. Wear sunscreen. Exercise, etc.
Second, accept that most other people are practically another species. I commend (and share) your desire to embrace all the experience and emotion that life has to offer. That doesn’t transform us into “one of the gang”. Our experience remains one that other people just won’t get. Look at how many Quora questions aim to grasp the mere meaning of the word “existentialism” – what other concept has made so little sense to so many people? It will cause you heartache to deny this.
Third, find the source of your intellectual masochism. You already spent a decade in grey over a question without an answer, so why are you chasing another question that has no answer? I do that because I don’t want to accept the absurdity—the feeling that I’m being Punk'd in The Matrix, spinning invisible thread for a naked Emperor—and I don’t want to accept the freedom and responsibility that comes from having no rule book. But don’t take my reason, figure out your own.
Fourth, figure this out: do you really want to sing and dance, or do you feel like you could if you wanted to? If you just want to sing and dance, the Nike method will solve all your problems, and systematic will follow. But people that plainly want to sing and dance don’t usually worry about doing it systematically. More likely, you want to know something – to feel less unsure, more agile, more at home in your newly vibrant, but unfamiliar world. If you want something like that, or something harder to describe, try to figure out how to describe what your really want.
Fifth, and only take this recommendation if the preceding points made sense to you: