Product is going to dictate color options.

Figure out what product you're using first. Appropriate product for this application typically has a very limited so be prepared.

Sherwin Williams had a line I can use and you can use any of their colors in it.

Do you know what product is currently down?

I am not exactly sure but it’s some brand of kool decking like sundek

This is the look I’m going for

It would be a good idea to know exactly what it is because that's pretty much the only way to know which product is compatible to be applied over it.