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I asked chatGPT it said: Lychee has a unique flavor that's often described as sweet and floral, with hints of rose, pear, and grape. The texture is soft and juicy, similar to a grape, and the taste is both refreshing and slightly tropical.

That sounds like a good answer. I guess the carbonation killed the flavor of the drink and made it how you described it.

Yeah, the more it sat the better it tastes 😆 I think the carbonation definitely is the problem

It could be worse: actual hydrogen peroxide in the drink. That would kill your throat and digestive tract, where the body isn't ready to handle the H2O2.

well the rum and coconut syrup certainly helped