Start re building from scratch
Heres info about what happened https://www.mangago.me/home/mangatopic/21255174/
This happened because there was a crash on the manga go discs and the lists where lost. Only the tagged or rated works stayed. I recommend you check your comments and history to see what you've already read, or check others accounts for manga, but otherwise there's not much else you can do besides searching them yourself
Hello. Sorry to say that about 2 months ago the MGO disk/server suffered a severe crash/glitch. It was the sever that maintained the lists for the readers. The only books/comics that were able to be recovered were those that were star-rated or tagged and even then not everyone got them all back. So, at this time, it's best to start rebuilding your lists rather than waiting for another recovery attempt. Also, make a copy of your lists going forward for your piece of mind.
This is the comment I saw 2 months ago. Has been going on for a while. Basically I lost my whole list too except the one I rated, it's not just you. (Whether it's 3 or 5 stars)

Hi everyone good day I'm reading here at mangago for at least a year and I notice that my history of all the manhwa I read despair huhuhu
Just like right now I stop reading manhwa and manga for at least a month because I was so busy for our research paper but when I open my account in mangago I found out my history is gone then the last 10 I read is the only manhwa I can find in my history huhuhu
What should I do guys? Help me or give me some tips about what you do when you encounter this please