OMG I FINALLY FIXED IT. IT WAS ONEDRIVE ALL ALONG!
THAT STUPID THING CHANGED THE DEF FOLDER OF MY DOCS FOLDER, AND BECAUSE OF THAT SKSE COULD NOT FIND NOR CREATE SKSE FOLDER IN MY GAMES WICH IS LOCATED IN DOCS!
If you deleted OneDrive, the OneDrive folder will still be there, messing your folders
FOR ALL OF PEOPLE GETTING THE SAME ERROR
HERE IS WHAT TO DO:
Check you docs folders defult location. Click properties from quick access. If you see OneDrive then you shall change it.
Click Location tab in Docs properties and click restore to default. Here's the video on how to do it
If that doesn't work for you and you get an error likethe folder already exists and etc, you have to reinstall and sign in to OneDrive if it was deleted. You can download it HERE
After installing OneDrive you need to turn off the backup of your docs folder. Here is how to do it. After installation OneDrive may start backing up all your existing folders content, let it do it. You can't access the settings while it's backing up.
After turning it off, go to your C:\Users\steam folder. Go to OneDrive folder and move Docs fodler from there to Docs in C:\Users\steam. Replace all if needed, or skip some files.
After doing so, try to change the default location of Docs folder again. Here's the video on how to do it.
If you did it successfully, you may delete OneDrive from your pc if needed. That's it! GO ON PLAY THAT OLD GAME WITH 3000000+ MODS!
Some more useful links:
https://answers.microsoft.com/en-us/windows/forum/all/cant-move-the-documents-folder-using-location/ab4fdcff-a8eb-4a5e-88dc-cbc85310fa6d
https://support.microsoft.com/en-gb/topic/operation-to-change-a-personal-folder-location-fails-in-windows-ffb95139-6dbb-821d-27ec-62c9aaccd720
IF YOU ENCOUNTERED SOME ERRORS DURING THAT PROCESS, WELL, GOOGLE IT XD. NOW THAT YOU NOW THE CULPRIT IT WILL BE AN EASY TASK TO FIX IT. HOPE YOU ALL WELL AND HAPPY MODDING!