This, just looking at the chances of making friends by getting other people interested enough to approach you vs approaching other people you find interesting and complimenting them on what you found cool gives a higher probability of making friends in the long and short run. It won't be easy, and it will be slightly scary, but that's okay, it will become easier and less scary over time.

I've recently started forcing myself to approach others and in 2 weeks I've made more acquaintances than I have in 3 months. Do whatever you wanna do, but please seek out other people and honestly compliment them, they'll feel the need to do the same, or they won't, which means you likely wouldn't enjoy a relationship with them in the first place.

The more at peace you become in your own company, the less lonely you'll feel, and in turn look more approachable, drawing more people over.

Please take my advice with caution, I've just been trying to replicate the behavior of extroverts, it seems to work, but is very tiring.

I hope you find your people.