email search

My search function will only return emails dated after January 2023.  I can see and access emails in my inbox back to 2017.  While older emails can be scrolled to and opened, they do not appear in the search results.  I see in several forums where email boxes were rebuilt.  This was a very useful function in managing my inbox, projects and payments.  I've been on phone multiple times but no fixes have been successful.  Please HELP.