This might not be what you are looking for, but my son was accepted to 3 of his 4 choices, looking back it was a blessing that he did not get admitted to that one. He’s in a much better place where he currently is with academic success and excelling in ROTC. I’m not sure how taking a gap year will make you more qualified to be admitted. You might be in a better position to start somewhere else, prove yourself with ROTC and your grades and then attempt a transfer. There’s not guarantees that will happen either. You want to give yourself the best shot at getting through college and commissioning so it could be better to bloom where you are planted. Congratulations on your scholarship! You have much to be proud of!