Do I need to be very good to make money as a Web Developer?

I am having a problem understanding the following ...

I am an okay web developer. I am not great. But I want to make money from my skills.
Having said that, when I go to websites like Freelancer to search for a project to work on everyone is asking for an exceptional developer and they pay very little. I don't know how are average joey's make it in this business.

What is your take on this?

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