Did anyone else struggle junior year?

Hey everyone! I’m a junior majoring in aerospace engineering and for some reason, this semester has been SUPER HARD for me! I’m passing all of my classes but my GPA has definitely taken a hit. I’ve been trying to study more, go to office hours, and do everything I can to try to mitigate this but I’m still getting mid C’s on most exams. Does anyone have anymore recommendations or is this just a “universal experience”? I’ve always heard that the average GPA for engineering was pretty low.