How to improve in 10 min rapid from ~ 1500

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dinumatei
I will like to know how you can improve your rating from 1500 10 minutes rapid. I blunder a lot and i did not found a solution in how to stop doing that. I do better on daily games but i will like to improve in rapid also. I don't know if at my rating is a good idea to develop a repertoire but due to the fact that i want to be thourough, i got stuck in endless variations on Ruy Lopez. Maybe choosing Ruy Lopez for my repertoire was a bad ideea, i don't know. Can someone recommend me a good book or any other advice on how to improve my rating on rapid?
tygxc

@1

"I blunder a lot" ++ Always check your intended move is no blunder before you play it.
Invest a few seconds to double check before every move.
You may occasionally lose a game on time, but you will save many losses by blunders.

"choosing Ruy Lopez for my repertoire was a bad" ++ It is good.

"how to improve my rating on rapid?" ++ Whenever you lose a game, stop playing and analyse it thoroughly so as to learn from your mistakes.