There are two ways to gain speed - better mechanics to generate more force or same mechanics but more force input by getting stronger. This video will cover better mechanics

How your golf club applies force to the ball determines the outcome of your golf shot. Learn the specifics you need to understand to to be able to bring about a desired outcome.

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If you are not able to recognize danger you cannot expect to eliminate it. Regardless of the player everyone falls into the same category of misses. If those misses match the penalty of the hole you are playing you need to recognize that and apply force on the club in a way that applies force on the ball to eliminate that danger without eliminating your need to play defensively.

If practice were about hitting balls on a range everybody would be getting better. Knowing which parts of your game have more or less outcome to your score allow to you to focus on those areas while working on mechanics, playing the game and keeping track of progress or regression.