WILL THSI BRING UP MY GPA!!

I have been taking classes at my community college non-stop, and because I never get an actual break my GPA has kind of suffered. I have a 3.1 and plan on taking some classes during the summer (like i always do). Well the problem is I don’t really have any classes to take because the ones i need aren’t offered during the summer, and i’m really close to transfering. I was wondering if I should retake one of the courses I got a C in order to bring up my gpa? like one of my english classes.