I miss how much more I could get done back when (a) my inbox was tamer, and (b) I would regularly work late into the night, when it's quiet and distraction-free.
why isn't the late night quiet atm?
Agreed on the night with no distractions. Not sure about the inbox as I have 11k unread messages!
Are the emails subscriptions/regular stuff? If so, add more filters!
If they're real people / needing attention, then timebox them to once or twice a day (I prefer right after lunch only).
I know the feeling. Same goes for leading a team.
Try and see it as a positive - a forcing function almost. Sure, you have less time to get stuff done, but this (hopefully) forces you to prioritise better. So you can get the same results in a shorter time period.