Time to
1) grab/download the entire mailbox from Gmail 2) delete the mailbox at Gmail 3) export all gdrive data, use the export function 4) delete the gdrive data
5) register with fastmail, yandex or protonmail 6) start mailpile on your raspberry pi or similar 7) use mailpile as frontend for yandex/protonmail/other-imap account.
8) nextcloud as good enough but shitty replacement for gdrive
Self-hosted ftw.