Many recreational golfers lose clubhead speed because they don't know how to use the body correctly. One of the most common faults I see is collapsing the upper body at the start of the downswing. This usually creates a steep angle coming down, and the body rotation will tend to stop before impact, which reduces clubhead speed.
Make some practice motions without a club and expand your chest and stomach muscles as you start the downswing, as if you were Clark Kent tearing your shirt open to change into Superman (above). Keep that feeling as you turn through to your finish, and you'll get much better rotation through the shot and stronger impact.
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