I wouldn’t bother taking the SAT or ACT again unless you can do really well. My point is that school ranked like Hopkins, Michigan, or Berkeley, much less Stanford, mostly accept high school students with almost all As in almost all AP classes, 30+ ACTs, and 700+ SAT IIs. The 4.0 is good, but it is against weaker competition. So it isn’t a lock somewhere like Michigan will take you as a transfer, much less Stanford.