Stay in therapy and go ahead and try Ketamine. Keep in mind that not everyone "qualifies" for the treatment based on initial psychiatric consults. I've heard very good things about it working where other medications, etc. have failed.
Your story resonates with me and I'm considering Ketamine as well.
Two things that have helped me immensely in the past was exercise and taking up a new hobby. For years, I always wanted to try woodworking and a couple years ago I started. I've found it helps in a couple ways: it distracts me from whatever is going on in my life and gives my brain a rest. Second, it diversified my time while learning something new. There's something special that happens when you're learning and building something with your hands at the same time.
Another thought is to look enlisting the help of a life coach.
No matter what path you choose, good luck brother.