Sorry you're going through this. I've lost online friends because they've quit, taken breaks, found other friends, etc.. It sucks because friends are friends, whether they're online friends or not. :/

Are you the kind of person who likes to approach people? Could you approach other people on that site to see if they want to be friends with you? I don't mean like, "hey, u wanna b frendz??!?" But just hit them up and see if something becomes of it.

I like to compliment people as a way to make friends. For example, they may post a picture of new sneakers they got. Then I PM them and say, "I really like those sneakers! Just wanted to say that. <3" I'm not saying be a suckup or anything, but if you like something they do or like something they have, why not tell them? Or if they're feeling bad, send a PM asking if they're ok and if they'd like to talk.

Initiating convos is hard for sure, but it can be a rewarding experience if you've never done it before (or if you've rarely done it).