A good way to get more creative is to just make a bunch of replays until you decide on what you like to do. What you like to do is probably what is nice to see.

And honestly, when I make a replay, I mainly think about what I think looks cool. This works because if other people have similar tastes to me, that means they think it will look cool as well. So I would say a good idea is to try and impress yourself, and impressing others will come with it.

Creativity is a hard thing to give general advice on because everything is subjective in regards to it.