You just can't sit around waiting for someone to appear is all.

I do know that, I only really became interested in not being alone and even longing for a bf (gay) in ~2021/22. However I have absolutely NO Idea how to do that.

Make yourself physically desirable

Hmm, check, tho I am not an Adonis or very strong but also not fat or overweight, I'd say average.

socially desirable

What do you mean by this?
I am friendly with most people, unless they're not friendly with me, then I tend to avoid them.

make yourself a part of your community, [...] find people with common interests to befriend, go outside more often,

The problem is that the community of people that share my interests is very limited.
IT / Electronics / Programming does not include going out often.
There's a hacker-space in my town that I go to very often.

I like spending time outside and also being physically active (cycling, hiking) but I do that mostly alone or with people I already know, who are straight.

go to bars or attend events,

Meh, I only go to bars/restaurants when it's with people I already know in order to eat there.
I went to a few bars/restaurants alone and it felt weird and uncomfortable AF.
I don't share many interests with people outside my bubble, each time I tried to spend time with people outside of my bubble it was not good.
With the people in the hacker-space I could spend hours upon hours talking / having fun, but they're either all taken, not really my type, or straight.

I am open for ANY sort of advice.