My lost Chinese deck and recommendations

So I recently logged into my account after not using my deck for quite a while (perhaps a couple of years) and found that all signs of it are gone, and all reviewing history also gone, as if I’m a brand new user. About 10 years ago I spent countless hours creating my deck of thousands of cards, was really looking forward to getting back to them, but appears as though they are all gone.
If no one can point my in the direction to somehow recovering them, then I’m wondering if anyone has a good recommendation for Chinese decks only in the intermediate-advanced stage. I reside in Taiwan, and have seen a couple good decks that I’d like to use, but they go all the way from book 1 to book 5, I’d really like to skip over the first 2 or 3 books, but don’t know how to do it.
Thanks in advance for any help you can give!