This is what I do, when you practice in Ab or Db try taking it up a half step and learn the song all over again in that key. If you are anything like me you notice that the keys we play have a certain pattern. Find the pattern in the other keys.
The thing is not many Gospel music is written in A,B,D or E but it can be done.
The keys of A and B are still my problem keys but it is getting better, but I am about to start a theory class so maybe that will help to, I was forced to play piano (which I love) when our piano player up and quit 2 years ago. I still have a lot to learn but my best teacher has been just doing it!
For songs in the Key of E check out Israel he seems to really that key.