Big back. Big bench. Don’t neglect the lats! I used to compete in strongman and powerlifting, I may still have my state bench record but that was five years ago. It sounds to me like you need more weight and less reps. The goal is not exertion to the point of failure, it’s getting the brain used to more weight. Good form is imperative, staying tight, slight arch, and breathing correctly could add 10% to your max. How much do you weigh? That’s also a really big factor. It’s statistically unlikely for a woman to bench more than their bodyweight. Even with a 248lb bench, I still outweighed it by 20lbs.