What do you do when you get stuck?

So I just started working on a big project that I’ve been brainstorming for the past couple days, I got the first sentence written out and then… nothing. I’ve been stuck on the second sentence for at least an hour now. I’ll write something, not like it, delete it, and then the process just repeats itself.

So basically what the title says: what do all of you do when you get stuck in when you’re writing? Admittedly a bit embarrassing it’s happening to me so early on in the fic, but I really wanna write this so I was hoping someone here might be able to help push me over this hurdle a little bit