This process took for me a year or so…but now I am finally there. 3 protonmail accts and nothing else.
One for personal/family/bank/official/insurance One for everything which I need longer…e.g. Logins to webpages One for online shopping/tickets…this one I delete every 12 months and create new, because here annoying spam from vendors is piling up
If you have a Google Pixel phone then install grapheneos and all becomes a “can” from a “must”