I ask them to come over, then I ask them "Hey, mind if I play this for you and you tell me what you think?" basically. Alternatively, send it as a .mp3 via Whatsapp/Telegram and ask for feedback, but that's almost never as fun or useful.

Best way to meet like-minded people is to go to music events where those people are, always a ton of music makers around those, usually also by themselves, sometimes in the back or on the side to the speakers. Most people in such events are OK with being approached by strangers :)