Splifton, You did great to go from 21 down to 10 in one season, I've never seen anyone in my nearly 50 years playing do that. You must have just started out. Now the same plateau effect occurs in all golfers, some get better, some actually fall back, most fall into their comfort range based on their athletic abilities. Many years ago I worked down from 15 down to 7 over 4 years and was stuck for three years at a 7. I thought 7 was pretty damn good and I was happy to be there.Then I changed to a group of better players, I saw how they managed their game.They did not hit the ball further or straighter than I did, they just plainly made fewer errors and they chipped much closer. We also played for a lot more money. You either played better or went broke. No one was given any strokes, all the bets were two man best ball so two 4's might play against a two and myself at 7. Long story short I went from 7 to 5 to 3 to 1 to plus 1 in the next four years. In golf you can always get better. Good advice in the post prioeto mine, You must be solid in all areas, work on it all, good luck