Using email less, honestly. Because I can't get to my home email from work, I've largely stopped following most of the mailing lists I was on, just catching up periodically. I've played with mu4e, and I'd probably use it more if I spent more time on a computer and network under my full control.

For my reduced email needs, I mostly use K-9 Mail (Android) and self-hosted RainLoop (web). For work mail I use Outlook.