On the packages of the old Cox UC airplanes it stated that the plane was guaranteed to be flyable. It followed that they couldn't gurarntee "you" could fly it!

Practice is what makes the difference. Just burning fuel is not practice. Continuing the same mistakes is not practice. Having a plan and following it to make whatever you are doing BETTER is practice. Keep a log (write it down or mental > doesn't matter which). Have a purpose in mind for a day's flying. Maybe you need to practice loops (keep them round and positioned center pole or ??)
This is what will make a difference.
Clear you head and burn some holes in the sky just for fun!

EXCAP232