I migrated from Gmail to a hosted domain on a cheap cpanel account 10 years ago.
That was fine for a long time. The trick was to setup an auto responder with the new address, then systematically go through each incoming Gmail and go update the connected account. Took about 2 years to fully migrate. More recently i moved my custom domain to FastMail, and I am very happy with the added security and ease of use ( MFA, application specific passwords, wildcard email addresses, contact , calendar sync etc...). I briefly tried protonmail for the higher security, but the lack of imap was a real pain, and the 50 shades of purple UI was ugly to me ... FastMail just works very very well....
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I migrated from Gmail to a hosted domain on a cheap cpanel account 10 years ago. That was fine for a long time. The trick was to setup an auto responder with the new address, then systematically go through each incoming Gmail and go update the connected account. Took about 2 years to fully migrate. More recently i moved my custom domain to FastMail, and I am very happy with the added security and ease of use ( MFA, application specific passwords, wildcard email addresses, contact , calendar sync etc...). I briefly tried protonmail for the higher security, but the lack of imap was a real pain, and the 50 shades of purple UI was ugly to me ... FastMail just works very very well....