Number one piece of essay advice from every admissions counselor, don’t write about volunteer/mission trips. It’s an overdone topic, along with “the big game” and “I love my grandpa”.
All schools care about GPA. It’s a defining factor in how well you did in school. Your test scores can be flukes (not saying your’s are, just in general), but your grades don’t lie.
Also, just a question. Why did you apply to so many schools? And why were so many of them reaches? All the non-UC/CSU schools you listed are reaches for anybody applying.
I’d suggest going back through your applications and seeing what might’ve gone wrong. Like someone said above, maybe your essays made you sound stand-offish. Or your course rigor wasn’t hard enough. Only 3 APs when most applicants to ivies take 8+ (if your school doesn’t offer them that’s different of course). Who wrote your recs? Did you have good relationships with them?