If you have access to water that is over your head, another thing you might try is vertical kicking: Fold your arms across your chest and keep your head above water by kicking. Focus on kicking from your hips and ankles - not from your knees. You can transition from this to horizontal kicking by doing vertical kicking and then letting yourself "fall" onto your back while still kicking.
If you spend a little time at every practice doing this, your kick should improve over time.
Bob
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