Next time you see a position that is supposed to be winning: capture the position, transfer it to your favorite chess program, set the program at a rating higher than your own and play the winning position to see how to conclude the game. Then go back and repeat the exercise at an increased rating until you can win against it at full strength.
The ending below is from a 2011 game of mine. I did find a winning path, but Houdini showed me a better method.
For the readers who wish to try this exercise, the FEN is:
8/8/1p3kpp/p1pp4/5PPP/1P1K4/1P6/8 b - -
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