I'm a parent of deaf DC,not a deaf adult but I just wanted to post to mention the things that have helped my DC with masks. My DS works with the general public and wore a lanyard/badge like the attached - they came from Etsy. I know not everyone is comfortable with lanyards/badges etc but for those that are, there are lots of different designs/styles and they really helped my DC (whose problem is not that they are deaf, but that some of the general public are ignorant and impatient knobs!)
Masks did make it more difficult for them, we used BSL a lot more, and perfected a fuck off look to anyone judging if I took my mask off so they could lip read. My DC are now young adults who have been profoundly deaf since birth (genetic) so in some ways we think it's "easier"'for them than those that lost their hearing later in life and I really feel for people in that situation. It can still be very isolating and lonely though even for my DC who are confident about their deafness.
We all learnt BSL when they were babies (again it was a lot easier for them learning as a language from scratch as DC, than for us as adults) and it has been invaluable. One wears brightly coloured BTE phonak aids (and they used to have pictures on their ear moulds etc, one had minecroft pictures!). One has also chosen to have a cochlear implant and it has helped enormously but it was a huge decision to make. Everything is Bluetooth which makes such a huge difference (all of this is NHS funded, they have been amazing in our area, as has the education system. Unlike the DWP but that's another thread! They also get concessionary travel passes (but the threshold is high in our area, speech has to be affected too).
The changes in technology and streaming to phones etc has transformed all our lives. I remember when my first DC was diagnosed - the hearing test was someone sitting behind DC shaking a rattle to see if they responded! We were involved in the rolling out of the newborn screening etc and lots of things with the NDCS. So their experience has been much more positive but of course it is very challenging at times (social v medical model of disability etc). My DCs speech has obviously been affected and people do judge on this, if they don't know realise they are deaf, they assume they have other SN/learning disabilities and default to patronising them and talking to them like they are very very stupid. Infuriating.
We were previously unaware of any deafness in our families but again, both DH and I had older relatives that were labelled as thick or lazy but these days probably would have been detected as being deaf.
I hope it's OK to post as I know
It can be annoying when someone actually isn't in that position themselves but wanted to show the lanyards etc, and say thank you as this has been very informative to me. 
to those struggling, it can be very isolating and challenging. If people and society in general, were more aware and patient, I'm sure lives would be a lot easier.