Quality vs. Quantity in practice
Have you ever wondered why you sometimes shoot better when you don't practice as much. It is probably because you are doing more quantity practice than quality practice. Some people may have heard of the 10,000 hour rule, but if all those hours are mindless hours to get to a quantity than you won't get as good as fast as you can.
If you put together a well thought out practice plan than you will improve your skill level much faster than you have probably every improved. I can relate to this because I put together a well thought out practice plan and improved from a 25 handicap golfer to an 8 handicap golfer in about 3 months.