My list disappeared

I had a list of black actors from across the globe. It could be found on my page for a few years; in fact the first actor on the list is Chadwick Boseman which means I first created it a short time before he died. This list had ballooned to five or six pages and I believed had been viewed up around 6000 times. Just over a week ago I added another person to the list. Now, suddenly, its gone. With no warning. A second list I started less than a year ago of directors is still up and running. But not the first. What gives? Can I at least get the data back? I put a lot of time and effort into it.