The average rate of acceptance for film festivals is between 1%-15%. 1% for the top tier film festivals and between 2%-15% for medium, small and community-based film festivals. This is why you can't afford to gamble on this 1 chance of getting into that festival. (remember you cant submit the same film twice).
https://festivilia.publishnow.co/10-tips-for-your-film-festival-submission/