Some ideas:
Firstly, you have two tracks on that looper, so you can bring things in and out. One tip I have seen is to record the percussive stuff in track one, and the record your “backing” chord progression into track 2. You can then turn off track 2 playback to go back to just the rhythm track and play different chords over it. In that way you can do a verse-chorus type performance.
For performance use, you could just use the looper for rhythmic parts, bring different percussive elements in and out of the performance using the two tracks, and then just strum and sing over. That’s what KT Tunstall does, for example, in Black Horse and the Cherry Tree. In this her loops are mostly percussive textures and the “woo-hoos” that go throughout the song.
If you get the right notes, you can also do percussive single-note riffs which will work over multiple chord sequences. Pete Honore does this quite a lot. Then you can overlay this with live strumming. Think “Eye of the Tiger” if you aren’t sure what I mean by this.
With the two tracks, I think you can switch between them so one is a verse and one is a chorus.
You can also use the undo to remove what you just recorded and then record something new.
Or you can just stop the looper and play something else, before restarting it,
Or you could just record a longer chord sequence which has more interesting changes, like a 12-bar blues.
Another option, if you have another instrument, is to connect an A/B switcher or a mixer in front of one of the inputs so you can overlay other sounds, like bass or a synth.
A lot will depend on your usage. What you do to create backings to play along to for practice will be different from putting together a performance.
By the way, the loop jam was great.
Cheers,
Keith