How should I answer this politely? "Would you like to give it a try?"
My Client sent me a text message saying: "Looking to improve my logo or make something completely new. Would you like to give it a try."
As a native, how would you answer this?

Question

Answer

If you want to do it, you could say 'Yes, I would be more than happy to help you with/on this project.' 
If you don't want to do it, you could say 'I'm afraid I'll have to decline/I'm afraid I already have lots of work at the moment.' 
Hope this is helpful!

Answer

If you want to do it, simply say yes or that you accept.  If not, then say you would like to decline.

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