Can't hear Zoom meeting on Android device in moderately noisy environment.

[DECH]

A volume booster is the obvious solution but none seem to have any instructions and only seem to work with Zoom via imposing the meeting on the volume booster page which then seems to drop off after a while. Trial and error has been extensive and the current conclusion is that the idiot proofing on phones makes them unusable for listening in other than fairly quiet environs - maybe high range active noise cancelling headphones are the only likely remedy.  If I were running a Zoom competitor then integrating volume leveling/enhancing would be at the top of the differentiation list.