I used to be a top rated developer on upwork even before they renamed upwork from Odesk. I stopped using them since 3 years ago and I would suggest you to keep away from it since the platform has become very predatory over the years.

You need to pay upwork continuously to be able to bid on jobs and you can pay even more to see other people's bids. It has become sort of pay to play scheme.

For example, they advertise and allow you to create a free agency account but you can't apply for jobs until you upgrade to agency plus.

There was also a recent case where upwork permanently suspended a freelancer's account without any recourse where the freelancer had $2000 in their account. I am sure that's not an isolated case knowing what Upwork has become.