I'm a "pro" freelancer in the tech space. You've already had many relevant tips and critiques here so I won't repeat them. Just wanted to add this one, as I've seen it firsthand with startups: you are focusing on you. You fail to make me, a potential customer pretty much exactly in the market you are targeting, believe you have any idea how freelancing works and where the pain and value adds are.
Genuine question and not meant as a put down: how long have you freelanced and have you experienced the pain you mention yourself?