How do I increase my chances of getting accepted at a College or University as a transfer student?

Right now im attending the local community college. The school im trying to go to is Clark Atlanta University. The school only requires 12 semester hours or 18 quarter hours to be eligible for transfer. My school is on the quarter system and so far I have 10 hours. Right now im taking 2 classes both worth 5, so after this quarter that would bring me to a total of 20. My question is, i know a certain amount of students apply for transfer every year but not 100% get accepted. Is there anything i can do to help better my chances? or is it just luck of the draw? When you transfer all they require is a transcript of the school you’re currently attending, They don’t look at past SAT or ACT scores or High School transcripts if you’re trying to transfer so the eliminates those options. Could my current GPA make a difference? Because right now im standing at a 3.0 and Clark only requires a 2.5. Could a good letter of recommendation help? I also have room to take on a 3rd class this quarter so maybe having 25 transferable credit would look better than 20? The only thing is i don’t want to take a 3rd class right now if I don’t have to, if i do i can kiss getting an overnight part-time job goodbye (lucky for me I have HOPE) I don’t have long to decide if I should add that 3rd class since the late registration is friday. Bottom line is, what can I do to guarantee or better my chances to getting accepted as a transfer student?