"Horror movie sequels usually end up not reaching the same level as your original movie, or the audience doesn't tend to expect anything when sequels are released. And it might even be a good thing, because some of them could surprise us.
And this can happen, even in classic horror franchises where the original has even more fame than some sequel during the franchise. So we have "Friday the 13th" and "Child's Play" as examples, which you can see in this list.
It's also nice to note that great filmmakers with these sequences of their films felt free and wanted to innovate, even risking something quite different from their predecessor. This is about horror directors names like Wes Craven, George A. Romero and Joe Dante."