People who were bronze/silver for a long time, what changed and how did you climb?

Generally I'm not horrible at the game but I do have moments where it shows that I definitely deserve to be where I am. Some games I'm truly awful, some games I do extremely well and yet I still can't end the game. I'm bronze/silver for a reason. For those who have been stuck for a long time and are doing much better, what changed? Please go into details. Thanks!
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