Upgrade from 1.X to 2.0.7 to 2.6.1

After I upgraded from version 1 to 2.0.7 and then to 2.6.1.
Now I try to enter the DB. And what I used to be able to do, I just can’t.

I see that now I need an org and I don’t have one and I don’t have a user either for the UI or the CLI
Can someone save me from this situation?

When I try to setup it says:
Error: instance has already been set up

when trying to list my orgs I get:
Error: failed to list orgs: 401 Unauthorized: unauthorized access

I created a user, org and auth. now how can I connect the UI?