Now that you can start jupyter correctly you need to look at the configurations of your cloud how can you create a rule to accept inbond connection from remote IP to internal IP in that specific port are you using…
You will probably have to use 0.0.0.0 or set your internal IP address on the jupyter and have this rule on the firewall to enable you to reach your papaspace. I personally don’t use cloud computing but all of them has some way to enable it. Try to look for a tutorial in how to enable ports and inbound connections to instance.