Can not get to admin/login page after moving subdomain to domain

Oh, it is late and I forgot:

My site is: https://www.aku-kur.dk/public_html

It used to be: https://testing.aku-kur/public_html

I will be so great full if someone would help me, Thank you.

That was wronge, my subdomain was:
https://testing.aku-kur.dk/index-filer/

Hello again. If anyone ever come across the same problem, this is how I solved it:

First I delete all themes, that I wasn’t using and change the names of those I was using, so I was left with the default-theme

Then I went to the page:
https://www.wpbeginner.com/wp-tutorials/how-to-fix-error-too-many-redirects-issue-in-wordpress/

I only needed this first to use this first suggestion – I quote:

In case you don’t have access to WordPress Admin area, you can still update these settings by defining them in wp-config.php file. Simply connect to your website using an FTP client. Once you are connected to your site, you will find wp-config.php file in your site’s root directory. You need to download and edit this file using a text editor like Notepad. Simply add these two lines to the file and don’t forget to replace example.com with your own domain.

define(‘WP_HOME’,’https://example.com’);
define(‘WP_SITEURL’,’https://example.com’);

Save the file and upload it back to your web server. Now try to access your WordPress site. If you still can not access your site, then try to add your domain with www prefix.”

I hope this will help others – if not check the above site out for more.

After I returned to the admin control panel, I went back to my web host and change the names of theme back.
Then I downloaded the contents of my site again to my computer to have a fresh new backup.

I should also add, that you need to change the two URLs in your admin panel under setting – general setting to mach the two you have change in the wp-config.php file.

For example:

define(‘WP_HOME’,’https://example.com/public_html’);
-which is where your site is installed on your server and this should be written in the second “field web site adress” (maybe it is not the correct name of the field as I am translating it from danish) – but it is the second field

define(‘WP_SITEURL’,’https://example.com’);
-this is what you want others to write in the search field in their browser to come to your frontpage and it should be written in the first field in the general settings the “WordPress adress”.

I hope this will help you if you have the same problem – which toke me hours to figure out.
Best of luck.