1.12.2 - I have some doubts

Hello guys, well, how i can start this? xd

Well, so, previous years I created a modpack in version 1.7.10, and so now I decided to upgrade to version 1.12.2, my question is: In version 1.7.10, I created a file called 1.7.10 inside the "mods" folder, and put there librarian type for better organization, and I'm trying to do the same trick to 1.12.2, but apparently, it's not working, it doesn't even load the mods that are inside that file, I created a 1.12.2 file, made mistakes saying I had too many versions, and then I read a lot of the .json files, and renamed it to "1.12", and it's no longer giving more errors about versions, but still doesn't load the mods that are inside that file, so is that doubt, can anyone give me a little help?

Thanks.