As someone mentioned before: play boardgames. The nice thing is you don’t need any cause we gamers already have plenty and are always looking for people to play with.

Also go volunteering. You’ll meet people of different ages, genders and backgrounds. I myself volunteer in a youth centre in my neighbourhood. Initially I knew no one on the streets. Now people recognise me, teens and parents alike, say hello and acknowledge me. I myself like this. It makes the neighbourhood feel more welcoming and save. Initially I „hid“ behind our counter having a save distance between me and the teens until I felt comfortable and feeling like I can intrude their space. It takes time. But it is worth it.