I need someone to edit a contest entry Short Story - 2500 words

I want to submit my 2500-words short story to a contest, in time for mailing, deadline February 28, 2022. While I have a reasonable grasp of grammar, I am not an expert. I find myself questioning this piece. It has challenges in terms of narrative and tense as I flip between scenarios. This contest win is very important to me as the prize is a mentorship, which I could really use for the book I am writing. I am very proud of what I have written but would hate to lose a chance to win the contest over some blighting grammar error. I would need somebody that could do it fairly quickly as I need time to post in in the mail before the deadline. They will not accept electronic submissions.