You said that your sibling is at Dartmouth. Your sibling could be a great resource for you in terms of what to do and not do.
Tips and tricks – if you are really that good of a piano player then reach out to the band/music program directors at the targets and see if they are looking for one. Consider applying as a music major. It is one of the few majors where talent trumps unrelated ECs. But then again, the top musicians aspire to go to conservatories.
Lots of great tips from others here. Pay attention and good luck!
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