The defects will stay on your account for a year and, until the year has passed, Ebay will email you monthly to remind you that your account is at risk.
Not exactly motivating but it is one of the procedures that Ebay has.
There is nothing you can do practically but my advice would be:
Wait it out
Ignore the emails which essentially are sent automatically and don't really mean anything
Make sure you don't get any more defects.
Lots of sellers, including me, have been in a similar position. Remember, it's not personal, it's just Ebay.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)