How much of your inbox activity is initiated by you? What percentage of your email threads started with an email you wrote?
And how much is spent replying to others?
And finally, how often are you bccing or being bcced?
I hope we can agree that the percentage for the third category should be close to zero.
But for the first two, the simplest way to change your day is to dramatically alter the percentage of the first two categories so that you’re adding way more value for others. In whatever way works best.