Unscarium

Hello, I have been using forge for a few years, although this is my first time posting on the forums. I use folders with different version names to organize my mods, and up until now it has worked perfectly. However, I recently got the 1.16.4 forge and created a folder for the mods. But when I launch my game, it doesn't detect the mods in the 1.16.4 folder. Can anybody help?