Zend certified PHP/Magento developer

I have Changed custom admin URL from admin panel, new url not working and getting admin url 404 error

i changed the base admin url using the admin panel and now i cannot access the admin panel.
i dont have access to the PHP file, im an online user, is there a way to find the new admin login url?
the old URL was https://row.mysite.com/en/admin/
and i changed it to https://row.mysite.com/en/myname/

now both url’s are 404 on my site.

i used this guide https://experienceleague.adobe.com/docs/commerce-admin/config/advanced/admin.html?lang=en

in the textbox for custom url i pasted the entire url from the top, does anyone have i idea where did the admin login go?