Yoga (there are lots of Youtube videos but a real life class is better)
exercise, I run a lot but also went back to swimming, I found that quite soothing
Reading (be careful what you read)
Go out with friends and do stuff even if it feels pointless
Go new places and do new things
Listen to podcasts
Get out in nature

I think I'm a few months ahead of you (BD last September) and it's probably only quite recently that I've actually started feeling like life is sometimes worth living. That dark place doesn't last forever thank goodness, though there are still some bad moments. Look back sometimes and see how far you've come and how much stronger you are now than when you started.