You've already received the suggestions I would have made. Definitely download a speech to text app on your cell phone and use it. Be sure to practice using it beforehand.

It's very important to be upfront about your hearing loss with the flight attendants, etc. Even with the passengers you may sit with. Let them know you lipread and are handicapped by the mask issue. You want them to understand what you're doing with your phone.

This is why members of HLAA have advocated for years that hearing loop technology and written notices be standard at airports and in other places where one has to be able to understand communication to know what is going on. It's difficult for us even without the masks.