I second what the first replier said. Make sure you keep up with the last updates page, check twice a day to make sure you didn't miss a single upload in the last 24h. When you find a manga you remember you read, check the authors page. Odds are you have read more than one work. Also make sure to check your want to reads, a lot, if not all manga you read is there.
That's what I have been doing and I am about halfway done recovering my read list in about a week.
As a safe keep for your want to reads create lists for them, also for the mangas you read and absolutely don't wanna forget ever again.
These are some of the best advices I can think of rn , hope they help ヾ(❀╹◡╹)ノ~
1. Use your previous (old) notifications to add to your reading lists. (This has been tested and works to start receiving notices again.)
2. If you have any bookmarks -- re-add them to your lists.
3. Use any previous comments (look at your topics section) you've left on stories here to help build-up your lists. Go through them and start adding.
4. If you have a favorite author find a story written by them and start adding the comics listed under their name.
5. Check your previous history (the little clock icon) and start adding. If you see nothing click the "Show All" and it should show you something.
6. Lastly, if you follow someone, look through their lists and start adding to your lists from there.

Hey y'all, does anyone have any tips to recover lists? I suppose I could scour this website manga by manga, but I wanna know if there's a more efficient way, so any advice?
I won't be adding them to my lists here, I'm probably gonna use somethin like bakaupdates from now on, and I'm just gonna wait and see how the situation in the website develops.