Do not use UpWork. They take a big cut, the clients you get are generally garbage, and they can close your account (and even keep your funds) for any reason.
I used to use UpWork extensively 10yrs ago, with lots of success. We tried to use UpWork recently and cant even create an account. There is no real way to figure out how to make it work or what the issue might be. The site has gone downhill fast.
No, I am not, but someone explicitly asked you for an alternative. But it's nice to have an alternative ready, otherwise you just sound bitter. Plus, you are not adding to the discussion, the reader is stuck with the same original question - where do you find contract work?
They asked me for an alternative, and I'm giving low value comments by saying I don't have one?
Not all comments need to add to the original discussion. Saying I do not suggest someone uses Upwork and giving my first hand experience of using the platform adds some value to someone.