Removing the ipados 14 update profile and features I got from the site “beta profiles” off my iPad mini 4

Hi ,

I recently got the iOS 14 update profile of a link . I downloaded it from a website called beta profile. I can not remove it I have tried to restart my iPad mini 4 but the features are still here . And in the settings place is says that I’m up to date with the Ipados14 update . Please help me remove it without a computer. Please help me I want to go back to my old software update which is the iOS 15.4 . Please get back to me as quick as possible.

have a great day or night