I feel ya, I kept my gmail account(s) many years before I realised I didn’t need to check on them “just in case” anymore lol. What helped at first was using 33mail for all the less important stuff, shopping receipts etc. Even today I create domain aliases only for addresses from which I might send email, most of the rest goes into 33m or addy.io ; They make it super easy to switch mail accounts because they’re intermediaries.