If you still have a valid Non-OA visa that is expiring you can leave and re-enter on or before the day it expires and get a new one year entry.
If you are on a extension of a permit to stay from a OA visa entry you can extend it up to 30 days early or 45 days at some offices.
Are you aware the insurance requirements are increasing on September 1st. You will need $100,000 of insurance coverage that also covers covid 19. Info here: https://longstay.tgia.org/guidelineoa