OP, I tend not to supply direct answers. Rather, to encourage kids to do this better digging on their own, first. Then, as your own understanding grows, many of us can help in various ways.
No, you can’t change the 4 scores, wasn’t suggesting you could. But the competition for tippy tops is, unfortunately, stuffed with kids who show top performance all around (stem wannabes with more 5s, fewer 4s, if any, in humanities AP.) Not just top scores in what’s most related to the hoped-for major. It means having some colleges on your list that are less demanding in their expectations than those you noted here. If you have that covered, via affordable matches and safeties, great.
The time from now to hitting the Submit button is long. You will change and grow over that period. We have no idea if you might shift some activities or add more with impact, how you might handle the written portions of the app/supps, etc. (That alone requires understanding what the college wants to see in you, the traits they value.) You might make changes and get a coveted admit. But your issue, at present, imo, boils down to missing the part where tippy top colleges want to see rounded strengths. Not just in your major interest area. You say you feel either CS or med ECs are valid. They are. But both are stem related. Now, where do you show the “more?” You say you “have given considerable time into picking the right activities for a major in computer science.” But what about the fact that, again, this is just the stem side of things?
TTs want to see your intellectual curiosity and awareness goes beyond your pre-set stem interests. That you’re an open thinker who willingly chooses to be involved in these other arenas, making other sorts of contributions, as well. (MIT has a nice bit in their admissions blogs about not being unilateral.) They want to see, via your record, that you interact with a variety of others, not just stem-oriented kids.
I’m going to stop there. I believe digging in and learning more can only benefit you. It brings a better understanding of what matters to the adcoms. Try it.