if the skin you are looking for is not here, try on circle people's site: https://circle-people.com/skins/?osu=Cookiezi&download=0
if it's still not there and you can't find it on google it's most likely private or hasn't changed enough to be worth uploading
It has come to my attention that there's a youtube channnel named "Shigetora" (https://www.youtube.com/channel/UC0L0Wfs9kIgz85Dd7opu4Qg) impersonating cookiezi. be advised that this is not shige, as he said himself on twitter: https://twitter.com/shigetora_twit/status/897602753215815682
Shigetora / Cookiezi skin compilation
Click on the skin name to download. If the download does not start or displays strange characters, press ctrl + S.