As others mentioned above, there are several crypto related websites that are already doing a pretty good job. The question you have to ask yourself is what are you going to offer to the public that is different from the rest? Similar functionalities from other sites but in an easier-to-use way? Are you going to create it for the knowledgeable people in crypto or new people in crypto, or both?

To create a website you first need to understand what is your goal and then what is your scope. To ensure that along the line, during the creation of the site, you don't deviate from your main goal.