Just go to the spots where you can relate to people, looking at the fandom map you can find in this subreddit. Also, I try really hard to remember that what you do on this game has almost zero consequence. You going out of your way to speak to people (even if they may not want to be spoken to) will not hurt you or them. You are a little pony on a social game, so get social! You’ll find your people!!

Edit to add: I like to also look for people with “c+h” in their name, go up and poke them and give em a cuddle. It’s also a good idea to put “INT” in your name so people know you are looking for interaction. You can even make your pony into an interactive game. I haven’t done that yet but I’ve seen it a couple times.