What to add to black parts in a video to make it more appealing?

So i'm editing a video and it is recording of an iphone. The video is 1280 by 720 and there are black bars on both sides. What could I add to make the video more appealing? Should I mirror it, should I add some kind of stock footage of a loop?

heres a screenshot of my video.
What to add to black parts in a video to make it more appealing

You could mirror it and also make it a bit out of focus and just black and white.

You don't have to use just one effect for the whole thing.

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