'How to update PR from which I deleted the source in GitHub?

I have opened a PR a few weeks ago. I deleted my local stuff. Now I need to update the PR. How can I do this?

I took a new fork
I checked out the PR (gh pr checkout xxx)
I made my changes and commited
I wanted to push but I got:

fatal: The upstream branch of your current branch does not match the name of your current branch. To push to the upstream branch on the remote, use
```
  git push [email protected]:xx/yyy.git HEAD:refs/pull/111/head
```
To push to the branch of the same name on the remote, use
```
  git push [email protected]:xx/yyy.git HEAD
```

But when I try that I get

ERROR: Permission to xx/yyy.git denied to my-user.

I can push the branch to my own fork but then I can only create a new PR? What steps should I follow to update my PR from which I don't have a fork anymore and there is no branch.

pull-request

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'How to update PR from which I deleted the source in GitHub?

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