Depends on your goal. Do you want to build a company or do you want to learn? Even if you have a completely unique idea, there's no guarantee that you'll find product market fit. Or maybe you have an idea that already has a market, but the current products aren't satisfying certain needs, or you think you can improve one aspect of the product.

I say build it, go at your own pace, and execute. The worst thing that can happen is you learn something.