I think the thing here is to pick something (anything) and go for it.
It happened to me when I was teaching and realised I didnt have anything outside of my relationship or job.
I picked rugby 😂 I had no idea if I'd like it or not. I had no idea what to expect. I was nervous. Several times I thought I'd pass on it instead of going. In the end, I thought, fuck it, I'm not doing anything else, let's see what it's about.
It was bloody great! Great bunch of ladies, lots of fitness but fun because it was with other people. I got a fire in my belly about it. I lived and breathed rugby. It was wonderfully supportive and social.
I left after a little while but some time later, I tried something else. I joined my local AmDram group. I've been a musician all my life so this is slightly different but my ex really squashed me down on my music. So finally setting that spirit free felt so good. Theatre isnt my strong point though. I'm an opera singer. I'd very rarely danced a set number. I hadn't acted on stage in a very long time. It was still all new and different. I absolutely loved it.
In summation, the things I had no experience of and threw myself into were the most liberating. But I wouldn't have found out about those passions if I hadn't just gone for it.
I suggest picking something... anything... sports like badminton, rugby (or tag if you're not so keen on the physical aspect), art groups, knitting groups, music and theatre groups, piano lessons, singing lessons, tap dancing lessons, choir. There is likely to be something going on. Even if you're not sure, just give it a go and see if it makes you happy. That will soon turn into a passion.
You are allowed to dedicate some time to yourself.