If this is you, here's a tip.
Don't go through your past emails one by one.
Go by sender, and put that sender in search. You probably have hundreds or even thousands of mails you can delete in huge chunks because you'll have tons of mail from sources you can instantly determine won't have ever sent you anything important. Make sure to unsub/block each sender as you go.
That then just leaves you with the actually important stuff, and your incoming volume will have massively decreased. The whole thing is often doable in a day.