How do I make new friends?

I’ve been struggling to feel close with my friends that I’ve had for 3 years. I (16F) felt and noticed that they don’t really care about me as much as others, and ik I can’t make them, so I want to find new friends. My self esteem can’t take the feeling of being unimportant in someone’s life anymore. I I’ve been working towards this for a while, just putting more effort into new or other “promising” relationships, getting to know other people, but I keep hitting the same ruts of people showing no interest in being my friend and caring about me. Im sure I’ll hear the same advice of “give it time” or “Some people might not be looking for friendship” but I’d like some advice if anyone has any!