Socialising online?

I'm socially inept, but I want to make friends online whilst it's impossible for me to make them outdoors. (A skill I don't have either.)

The thing is, I don't know where to find these communities to join, and I don't know how to socialise *at all*. I can't start conversations (I can't come up with anything to say for the life of me, and when I come up with something situational it always fizzles out), make appropriate comments or be likeable. I always get ignored on Reddit when I try to interact socially, so forums are likely a no go.

My interests are really vague and limited and I can't really find any communities with people I share common interests with because of them (gaming/anime/books), and I am absolutely terrible at coming up with what I've heard and seen to be the most important thing for making conversation, questions and small talk. I just can't do it, and I see other people succeed with it.

I used to have a friend who was similar but made loads of friends on Twitter all of a sudden, because according to them it just kind of happened.

I really want to meet new people and form connections with them, but when I can't socialise, and the pure hatred I feel for myself when I ssee and hear other people online with their own friends, making them without a problem, socialising, having people to talk to, it makes me feel like horrible, and I have no motivation to do anything becausr I'm naturally ambiverted I gain my energy from socialising then having my time to myself afterwards. Just my luck that I also happen to suck at socialising and have Aspergers.

TL;DR The only way I can get through this is following my therapists advice and making friends online, throughout Discord or other social platforms (which I don't know how to find and participate in, I only know of the latter because my therapist suggested it to me) I just cn't seem to find communities on there that apply to me or even feel welcome or socialise in those places successfully. I dont ever meet any new people online when people out there are even making friends every single day online.

What do you guys suggest I do?