Habits
Do not dump utility in the first seconds
In one line: Do not use abilities at the start of the round without a clear reason.
Why
An ability thrown at nothing in the first seconds gives you nothing. When the moment that matters arrives (the execute, the retake, the post-plant) you no longer have it, and you face it empty-handed.
How to train it
For one game, before every ability ask: what do I get right now? If the answer is "nothing in particular", keep it for later.