This^^^ you wouldn't practice your first backflip on concrete would you?
Go find a foam pit or an air bag to spin/flip into. You could progress your skill as a rider more in one session on an air bag jump than riding a whole season eating shit off jumps in the park. You need to train muscle memory correctly, you need to train in a safe environment thus eliminating fear.
Don't have access to an air bag, you may just have to accept the fact that you will need to progress by starting small and working your way up.