Don’t know if this will help….
I’m ancient but had a similar position when I left uni a million years ago, pre-mobile phones and the internet.
I basically joined clubs. Lots of them. As a surveyor, the company I worked for played a lots of inter-company sports so I joined the hockey team. I didn't play hockey at school but gave it a go. I also had a PADI dive master so joined the local diving club. I also joined a rowing club and the local gym and did classes.
Some of these things I only went to a couple of times but it saw me through until I made friends.
Sound stupid now as I was never sporty but it was one of the only outlets, at the time, that lots and lots of people joined and went to from different backgrounds.
Things are a bit different now and you may find arts socials or choirs or whatever you’re in to through a web search.
Hope you find your tribe. It may take a bit of time but stick with it. Good luck 🍀