My advice is to start building something and write about it regularly. Be genuine about it and people will want to talk to you. Post it to e.g. IH, they have a good forum. I've met some great people that way + I sold a side project. Don't be afraid to just write to people to ask them how they've built something that you like, people are actually quite supportive and willing to help once they figure you're genuine.
This IH podcast is good - https://www.indiehackers.com/podcast/108-sam-parr-of-the-hus..., quote from the transcipt:
"But I was always really good at doing that and the reason why was, I think that I didn’t have a lot of pride around like – I was never nervous to ask questions. I know that a lot of people who are my friends, they – I’m like dude, just go out and email this person and ask him how he does it or how she does it.
People were always nervous to do that and I kind of never been shy about that. My mom and dad kind of taught me that early on. Just go and ask them. Cold call this person and ask him. So, I think that it’s – you just can’t be too proud because I think that – I don’t know – maybe they’re afraid to look silly.
I think the second thing is I learned very early in life like before I was 10 years old, that people who are more successful than you or who are experts at what they do and you’re not an expert, they love seeing you succeed and they love seeing a young who will actually follow their advice."