Emails disappeared from the inbox

All of my emails dating from before 1/14/2021 have been removed from my inbox. I have called comcast and they walked me through the basic troubleshooting of checking the trash and spam, checking ipop and imap settings, and seeing if that fixed it.  Nothing helped. They said that they were sending the issue to someone else, and that i would be called back in an hour. I still ahvent heard anything 24 hours later. I today figured out that if i use the search bar to look for a specific email or sender, that all of the emails from that sender are still accessable through the search bar only. How can I get all of my emails back into my inbox?