@kiranrao there's no shortcut to it unfortunately, I use pass-rotate (sr.ht/~sircmpwn/pass-rotate/) for bulk updating passwords but there's no similar utility for emails since it's not something that comes up frequently.

I'm also effectively stuck with my GMail address despite moving off actively using it some 3 years ago due to banking nonsense and such but a decent email client more or less alleviates the pain of having multiple inboxes.