Preparing for transfer

Hey! I’m a currently a freshman that Is thinking about transfering after my sophomore year at my college. I was wondering if I should retake my SAT or ACT if I want to transfer to a top university. Currently I have a 2000 and a 30 on my SAT and ACT. Also which ECs look best for transfer applications? I am on the varsity track team, club frisbee team, and i write for the school paper. Thanks in advance!!