I am 65 and suffer audiometric notch ,aka "noise notch".
Listening with hearing aids sucks. and I have moderate priced and expensive (widex & oticon).
One of the things that is significant is cupping my hands behind my ears. Its amazing how effective this is. Obviously this is impractical.
But I have often thought about fashioning some contraption like this:
Update: I just ordered the cups off the Amazons , couldn’t pass it up they were so cheap.