I'm probably not exactly what you're looking for, but I went from considering suicide after I was diagnosed with an incurable disability that turned my life into an existence of pain, with next to no medical support or advice beyond "do yoga about it" to doing suprisingly well in life. I was also depressed before all of that, a shitty person and still trying to escape a really awful person in my life.

I turned it around gradually, but the two biggest things were getting the right meds (and being absurdly lucky to be one of the rare few who respond to it at all) and starting with a psychologist. Years of dealing with trauma and learning to accept and change the bad parts of myself eventually led to reading leftist theory, becoming an anarchist and meeting some incredible people. At some point in that journey I got on HRT and that did wonders for the worst of my depression too.

I'm at a point where I don't think I resemble the person I was two or three years ago one bit. I used to deal with all the bad shit going on in the world by just trying to ignore it and only caring about myself and those close to me, but actively trying to improve the world is infinitely better.