WordPress broken after domain name change

I configured my WordPress site to use a new domain name. I’m still using the same hosting provider. I have also set-up the old domain to redirect to the new one. Now, the thing I want to achieve is that I want to remove, from the site, all references to the old domain. However, whenever I point my browser to

new_domain.com/admin

it gets redirected to

https://old_domain.com/wp-login.php?redirect_to=https%3A%2F%2Fold_domain.com%2Fwp-admin%2F&reauth=1

If I point my browser to

old_domain.com/wp-login

it thinks that I’m requesting files in a directory named /wp-login and so gives me “Page not found” error of my site. But if I do

old_domain.com/wp-login.php

it displays the login form but on submit, I get redirected to

https://old_domain.com/wp-login.php?wpe-login=true

And finally, when I login, the url changes to

https://old_domain.com/wp-admin/

The other problem is that the theme is completely broken. I’ve inspected the html source whose and tags call resources from old_domain.com/path/to/resource/

I have tried all the solutions there are out there. Among those are:

changing the site and wordpress url from the dashboard settings.
applying search and replace all instances of https://old_domain.com to http://new_domain.com in the database.
trying the define( ‘RELOCATE’, true ); method; it sets the wordpress url to http://old_domain.com
in here When moving a WP site, why does wp-admin redirect to old site?, I found these define(‘WP_HOME’, ‘http://’ . $_SERVER[‘SERVER_NAME’]);
define(‘WP_SITEURL’, WP_HOME . ‘/’);. Applied them thinking this would fix it as I’m not hard-coding any urls. But these, too, set both the site and wordpress url to http://old_domain.com

Can anyone point me in the right direction?

I didn’t need to move the database or the WordPress installation around as I didn’t change hosting provider. So, as a last resort, would it be a good idea to delete the wordpress installation and reinstall it with all the themes in place?

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