Sadly, the time for asking this kind of question was BEFORE the shoot.
The audio should not have been recorded using only the on-camera mic.
At the very least, there should have been mics placed on or susspended over the stage.
“PZM”-type mics are sometimes used on the stage floor.
Sometimes wireless mics are placed on the actors.
Other times mics are suspended from the light-pipes above the set.
Sometimes there are combinations of these… all mixed live by an audio technician.
Recording theatrical presentations can require some creative microphone techniques and even then, it can be a compromise that needs some EQ and Noise-gate work in the edit.
The audio you have now (recorded at a distance) is likely nearly 50% made up of unwanted room-reflections (reverb) and noise from the camera, audience members, and the air conditioning/heating.
I’ll say that you should EQ down the lower frequncies and boost the mid-range, but no amount of EQ will fix the poorly-recorded audio track.
Adding and adjusting the Noise-gate filter can make a difference… but it can also make matters worse, depending on the audio track you start with.
Sorry.