For creators...volume
I know everyone listens differently. 99% of the time I listen on my phone speaker, with my phone on a counter, in my pocket or in my bra. There are podcasts too quiet to listen to this way so I just can't listen to them. I don't even own headphones and I am on the go, from floor to floor, so using my Bluetooth speakers often isn't an option.
All this to ask you make them a bit louder. People can always turn it down.
For example, I was just trying to listen to Neighbourly, its just too quiet with any other surrounding noises. I had to give up.