They aren't deleted you'll get them back.
don't worry, ppl whose acc were made in 2014 and 2015, as in earlier years, slowly got their reads back.
Currently 2017 ppl are getting it back.
https://www.mangago.me/home/people/65330/home/
https://www.mangago.me/home/people/7934/home/
https://www.mangago.me/home/people/12004/home/
so yeahh it'll take quite some time but you'll get them back.
also once they're back, in case you're looking for ways to save them perhaps in an excel file, I've made a tutorial on how to do it easily and quickly rather than having to enter everything manually one by one, so if you'd like, you can check it out.
https://docs.google.com/document/d/14Drj0CviUhrAmZlU-DC-AtxGFQoH1_PYQ81b2Vzu82w/edit?tab=t.0
it is currently a site bug, it's already explained here. https://www.mangago.me/home/mangatopic/21080691/ you don't need to contact an admin they are already working on it to get it fixed, just give it some time.
theyll be back. read the FAQS and explanation here :)
https://www.mangago.me/home/mangatopic/21080691/
also spreading this here regarding the concern about site exposure
https://www.mangago.me/home/mangatopic/21014248/

Recently opened up mangago and realized all my saved lists (want to read, read, reading) of thousands of manga disappeared. How can I contact mangago for support?