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 2018 users 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
no not if they haven't been added back to your list by the site or by you.
This is the answer I found in a helpful faq -
even if your mangas are saved, notifications depend on your login info to know which profile to send them to. If this info is out of sync, mgo cant properly link updates to your profile, which is why you might not get notified.
Here's the link for the FAQ
https://www.mangago.me/home/mangatopic/21080691/

Where's my reading list???? HELP?!? I mean I'm still getting update notifs but....where is all my stuff????