I have thought about getting toothpicks and putting one end against my cheek and the other against the mask to push it out from my face so I can breathe better.
fwiw- Ocean State Job Lot had these frames intended to go between your face and your mask to keep it away from your face. I think they were a couple of bucks. They were hanging by the aisle they have the toothpaste/personal care items. They also have the blue surgical masks which, at least for me, are less sweat producing that cloth masks.