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i agree with the guys above. One last thing to add is that typically a piece should expand or increase in energy from relatively "straight" (no/little embelishments, typically quieter) to more expansive/energy by playing in a higher register/brighter and including embellishments like more trills , slides , bends, fancy stuff. Eseentially i think of it like ...

To get a variation in tone, play one with flesh of fingers and another with your nails. Having said that, if you didn't much like the change of tone close to the bridge, you may not like this either.

Traditionally, these should be played with varying dynamics. Forte first time, piano second time, usually.

You could add some trills for variety on repeated sections. Not too much, just enough to break the monotony and give the song some variation and build anticipation. A slowing of the tempo to draw attention to key points can also make pieces like this come alive.

You could vary how you break the sections into phrases. The limiting cases would be to play the entire phrase staccato and then play it legato, but you could also make similar variations in the interior of the section.