Advice on making closer friends (15M)

I’m currently a sophomore in high school and looking(at this point kind of desperate) to make new friends. I do have some current friends from middle school and whatnot, however they are more reclusive and don’t often reach out to me, so I’m taking this as a sign to branch out. There are a few new people have I am friendly with and could be potential friends, however I am unsure how to become closer to them. One person in particular I feel like I get along pretty well with, however I am afraid to ask any of them to hang out outside of school. They are all already in friend groups, so I don’t want to sound desperate to them and run the risk of making our relationship awkward. I’m not sure if it is like this for all high schoolers/teens, but I feel like the only way to attract to people is to act like you are disinterested and already have many friends of your own. None of the people I talk to in school have initiated contact outside of school, even though we get along well in school. So what do you think? Should I just go for it and ask them to hang out? Any feedback is appreciated. Thanks!

TL;DR: Scared to ask new friend to hang out, don’t want to sound desperate.