I hope you’re well!
I was on the Payments set up section, in particular, “verify your personal data” area, I chose by mistake “United States” as my home address and now I can not change it.
In that case, it appears that you need to get that account deleted and start again with the correct country.
Please contact us at WooCommerce.com > My Account > Support. So we can help with that problem further.
You may need to create an account before you can access that page.
Please include a link to this forum thread, so that we can keep track of what’s already been done.
We will be able to help you further there.