Some schools you can:

1. take more credits/courses with getting better grades in them to increase your GPA; and/or
2. retake the course(s) you took previously and get a better grade(s) to improve your GPA, (the old grade and the new grade will either get averaged together or replaced with the previous one depending on the policy), (however some schools do not allow you retake courses at all);

it depends on the school's policy and which method is allowed (one or both). Check with your registrar's office. However, it is very possible to improve your GPA. Wishing you well as you move forward, good luck!