My high school GPA was way worse than 2.8 so don't be discouraged, that's a good improvement. What I would really focus on is learning how to study as others have mentioned. I legitimately, not being hyperbolic, had never studied in my life before college. It was by far one of the hardest parts of my freshman year. My first semester of college was my lowest GPA because of this. Thankfully, most universities have resources that can help with this. You have a lot of colleges left and can definitely raise your GPA.
I STRONGLY second was Goro said. I once heard, and agree with, that the smartest kids in college are the ones with tutors. It's a sign that you want to do well, not that you can't do well. I used to go there before tons of my exams and they will literally just teach you anything you want. After a while, you start to learn how to learn and you might not need to go anymore. Also strongly suggest active studying through problems as others have mentioned once you get a general handle on the material.
For Gen Chem specifically, my school had an optional recitation class that I took (and later taught) that was helpful for me.