How important is the writing portion?

Hi everyone! I just got my ACT essay score for the July test back, and while my scores for the regular test sections were phenomenal (35C, 35E, 32M, 35R, 35S), my essay was only a 9. First, is this score even good? I’m not sure what percentile it is, I saw 95th somewhere but it wasn’t on the ACT website or anything so I don’t know if I should trust it. If it’s not good, should I retake the test to try and get a better essay score? I’m applying to Ivies and other top schools which I think is probably important.