I think one of the things that works is finding users who you particularly enjoy having exchanges with, often the ones who you find sharing an overlap in interests with and who spends time in the same comms and who seems to enjoy replying to you (especially if the comment exchange goes for more than one or two replies).

The next step is usually connecting with them via DM or exchanging socials. Usually this is easier if you have a purpose for contacting them rather than trying to strike up a discussion from nowhere.

There is the visual cuisine which happens once a week, I think, and is announced in masterposts like this upcoming one. There's a chatroom in there which you can use to engage with others. There are other events like a peer support space that I try to run at least every week or so via the game Webfishing, although that might not necessarily suit your interests.

I've seen comrade CorgiWithALaptop invite people to impromptu viewing sessions via the visual cuisine cytube space but idk how that works exactly, but I think they set a good example of how to invite people to hang out.

I think this stuff is kinda hard to navigate as someone who is autistic because understanding the nuances of the whole thing can be kinda tricky, speaking from personal experience. Not to say that you should self-segregate but you might find it easier to try a comm which could be more accommodating such as the neurodiverse comm or to ask the mods there if they would consider helping you set something up via that comm if you feel like you would benefit from getting some assistance with connecting with other users or organising a group activity like a watch party via cytube, for example.