WHAAAAATTT

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

Read the FAQS and explanation here
https://www.mangago.me/home/mangatopic/21080691/

As for the concern about site exposure:
https://www.mangago.me/home/mangatopic/21014248/

Thank you so much you both for the replies!! The clarifications are hella helpful, so Ty

Btw about the saving of the library on an excel file, is there a way to do it in a mobile phone? If there isn't, that's fine I'm thankful of your kind consideration!!

You're welcome You can take screenshots or screen record on your phone but those are the only two methods i know of, also screen recording videos take up a lot of space so there's that too.