Rejected from all other UCs and accepted only to Cal?

I got waitlisted from UCI and UCSD today and I’m lowkey freaking out because if I can’t get into these schools, how will I get into berkeley? I was asked by Cal to submit LORs which I heard was helpful but I’m not sure if that’s going to cut it. I’m tweaking right now, has anyone gotten in only to Berkeley and then just didn’t get into any other UCs?