First off, I would stay as far away from Upwork as possible. That place is a haven for scammers.
Second, you may want to consider Remote Game Jobs. From what I was able to research and understand, It is a new website designed for bringing remote jobs to freelancers quicker as well as allowing recruiters to post their job advertisements to attract reliable talent faster, with some means of security. I only just found out about this last week and am trying my hand at it now.
If it also beats Unreal Slacker or GDL freelance sectors, it’s worth the try.