I’ve had my account since 2015 and nothing has come back :(

Its not just about when you made your account but when you added to your lists.
https://www.mangago.me/home/mangatopic/21092806/

I think it's bugged because the only mangas that have appeared in my already read list are the ones that I did rate, so I guess that's why you don't have any manga yet, you marked them already read but didn't rate it, not sure why its happening and if will they come back later but we'll just have to wait