If your petition is denied, then you can apply again at a later time. If you filed a request for early termination and dismissal, then you could wait until you’re off of probation, which may just be another year or two depending on the length of the probationary period. You can go above and beyond by staying out of trouble, not violating your probation and meeting the terms of your probation.
It’s really helpful to make a showing of the extra things that you’re doing, whether that’s community service, volunteering in the community, mentoring people or becoming increasingly involved with your religious institution. Those types of things can have a persuasive effect on the court as long as they are sincere and not done for purposes of getting off of probation.