I failed to create icloud on my phone

This happens when a) you try to log into Settings>iCloud (or Apple ID on Catalina) using an Apple ID which has not yet created an iCloud account, and b) the device you are doing this on has already been used to create three iCloud accounts. That three is the limit; after that you can't create any more iCloud accounts whatever you do - it's tied to the hardware, not the account, and deleting accounts from it won't make any difference.

What you can do is to create a new iCloud account on another iOS device or Mac (not Windows or Android). Once you've done that you can log in to that account on the first device without problems.

You can do it on a Mac or an iPad. Those are the only other options. Can youn get to an Apple Store (once they re-open)? They might be able to help you.