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I could easily make an exchange but there are so many already.
Then why not make a better one
Better how?
What can I do that would be better?
I use a few exchanges already and I don't really see anything I could improve on.
I don't really want to make a clone.
You can offer faster processing times, better exchange rates. With your web design experience you can offer a better user experience, a more intuitive user interface.
If you wander around the subject matter aimlessly, you are never going to get anywhere. On the other hand, if you drill down into one specific topic, your expertise will find plenty of play to discover your competitive advantage or unique angle that's better than existing ventures. That then happens to be your product, or mvp!