unable to upgrade to icloud+
My phone keeps telling me that my icloud storage is full. When i try to upgrade it to icloud+ it keeps telling me "Something Went Wtrong" "there was a problem upgradign your icloud+ plan. Try again later. Restarting phone didn't helpt. signing out of icloud and back in didnt help. What else can i try? i'm using a iphone Xs Max with ios 16.
iPhone SE