I want to downgrade from iOS 15 to 14

I want to downgrade from ios 15 to 14....15 is a mess and i dont want it on my device or wait for it to be updated... i switched a few hours ago frok ios 14.8 to 15.3 and im disgusted very much. How can i go to my prievous version? i dont want to join ios 15 on future unless its good.

[Re-Titled by Moderator]