Someone gifted me diamond membership on Chess.com, and I immediately started to use the insights tool. It showed me the type of tactics I miss, where in the game I play with less accuracy, and also what I should work on. This has been tremendously useful for me, because now I know what to look for. For instance, it shows me that I play with an average of 98% accuracy in the opening, but in the middlegame it's around 78%, and for the endgame it's around 89%, so the middlegame is the most important to work on. It also shows which type of games you are most accurate in. For instance, I am very accurate (around 95%) in balanced games and win the majority of them, but for wild games, my accuracy and win rate are small. These insights are special and teach me what I should work on.