Getting a boys attention

I desperately want to get my crush’s attention (we aren’t friends) but i’m not one to text my crush first or talk to them first so is there like body language or anything i can do to maybe get some attention out of him?? The only interaction i’ve had with him was him asking for nudes a few time but like never mind that hahaha I just don’t know how to get good attention from him. I’m pretty sure he knows i like him but i want him to actually have a convo with me that’s not about my ass