Genuinely how does one make friends in Highschool

I (15M) like to think Im a friendly and funny person, and I used to have so many friends when I was in middle school and into freshman year. I’m now almost done with my sophomore year and I have maybe one genuine friend and then my girlfriend. No joke, that’s it. I have people I’m friendly with and I talk to in my classes, but the last time I went out and did something with friends was Halloween, and that friendgroup has since split. I go to a secondary school so we have a middle and high school combined, so I’ve known most of the kids in my school for about four years, and I was REALLY weird in middle school (yeah yeah everyone’s weird I get it, but I was very weird) and because of that decided to join theatre at my school. I’m still involved today and I really enjoy it, but I’ve grown so much as a person since I joined, and now I have a million other interests I’d like to make friends from. I really want to be able to make more friends, but with two years left in Highschool pretty much everyone has their own friend groups figured out, and mine have moved on. My personality in middle school closed a lot of doors, and a lot of people still view me the same way. Every year I say will be better, I’ll be a lot more social in classes, make a whole new social circle, but everyone else is content with the friends they have. I’m so tired of seeing all the people I thought I was close with move on and get closer with other friends, seeing the posts about parties or hangouts with all of my friends but me, I’m just done. I want to move on and make new friends, but how can I do that when no one else wants to?