Hi again Mummiehunnie! - I feel like a new woman (honestly!) after 'talking' to you on here today in my thread, so thought I would try to reciprocate!
I was in a similar situation about 15 years ago, when I left an abusive partner. We'd been together so long, and he was so controlling, that most of my 'friends' were really his friends anyway. I moved away so he couldn't get to me and didn't tell any of my old friends where I had gone.
Anyway after a good couple of years of being a hermit I had a think about what I would like to do, career-wise, signed up to a college course, and started out with that. From that I made new friends, got more confident and started having the odd night out with them. It honestly kind of snowballed from there, really.
Fifteen years or so on from a time when I had some very dark moments, I am married to a lovely man (yes, despite his toxic family, he is still lovely, ha ha!), and we have lovely children and a pretty lovely life. There have been issues, (as you know!) recently, but overall I am happy with where I am and I feel pretty lucky.
And as it was a while ago that all this happened to me, I wasn't in my thirties, but I'm sure it's not that unusual to be - it's probably very common, actually, with lots of marriages, etc, ending in that age bracket.
All I can suggest is you take one little step - sign up for a course, or a class in something you fancy learning, and new friendships and experiences will follow. Best of luck to you 