You're playing that smokin' sixteenth tambourine pattern on the last part of the song and you know that final chorus should go up a notch in intensity.
What can you do?
Here's an idea:
Keep the sixteenths going and toss in some accented upbeats. Experiment with accents on the upbeat of one and three (similar to hi-hat opens) or on the "and" of all four beats...or some other variations.
It doesn't work on every song but when it does...POW!
You can really feel the tambourine give an extra "lift" to the overall groove.