If you are using an oldholden.com email address the service will stop soon as the Google service is ending, see here. https://support.google.com/a/answer/2855120?hl=en
If you would like to backup your emails one way is to turn the IMAP on in settings and use something like thunderbird portable to download everything to your computer/usb. https://portableapps.com/apps/internet/thunderbird_portable
The actual timeline may move but having backups done before May would be smart. I am not sure if Google has or will contact you directly.
It was a lot of fun.
Rusty / John