You know your chords. But when the tune takes off, you're not quite sure what your harp should be doing.
Do you play the melody too? Play some chords? What gives a reel its drive, or a jig its bounce? And how do you add enough without getting in the way?
When someone else has the tune, your harp has another job.
Think piano, guitar, or accordion: you're part of the rhythm section. You're there to keep the beat going and support the melody with rhythm and harmony.
And your harp can do that job too.
You don't need to play every note of the tune. You need to find the big beats, anchor the harmony, and build your accompaniment around them.
Start simple. Add more when it fits.
Because once you know how to find the beat and build around it, you have a process you can use with jigs, reels, and other dance tunes.