Check if the schools you are considering even superscore the ACT. Most schools do not.
My son applied to colleges early senior year and sent off his test scores. If his EA/ED choices did not pan out, he was going to retake the tests,maybe take some SAT2s for his RD chances. This way if the later test scores turned out lower, he did not have to submit them as the first batch were already at the schools and he’d only have to submit if there was an improvement. The problem with retaking tests when one is already right near the top is that you have a lot more room to go down than to go up.