I don't know how to make online friends if I could. It was slightly easier when I was younger and spent more time on the internet, but even then it was hard to find people online I could connect with. These days I forget everything and my ability to reply back and keep conversations going is awful so I don't bother.
There's a quote from Ruth Ozeki's A Tale for the Time Being that resonates with me:
"I swear, even on the Internet people can give off a virtual smell that other people pick up on, although I don't see how that's possible. It's not like a real smell, with molecules and pheromone receptors and so on, but it's just as obvious as the stink of fear in your armpits or the vibe you give off when you're poor and don't have any confidence or nice stuff. Maybe it's something in the way your pixels start behaving, but I was definitely starting to have it."
It's hard for me to meet/make friends in-person and I think I must carry the same off-putting traits online, or something. Not sure. I don't think people like initiating with someone who isn't likely to engage or reply back, but that wasn't always the case with me. Maybe they didn't like what I typed or how I typed it. I felt like too it was because I never really revealed a lot about myself online so people could never really find a meaningful way to reach out, which didn't help me with feeling isolated with my own thoughts and feelings with things.
I wish I could meet people online who lived close enough for me to know them in-person, that would be my preference, but it hardly lucks out that way. Unless I wanted to meet someone through an app or something, but I have plenty of reservations about those.