It maybe caused by version 8 of PHP. You can check the PHP version on your wp-admin(Art theme/System status) firstly, you can try to downgrade the PHP version to 7.4.x on your website server host cPanel.
If it doesn’t work, may I check your website? Could you please leave your wp-admin access (URL / username/password) and sever FTP account by picking up “Set as private reply”?
I found that your site always responds with 500 (regular actions like logging into wp-admin, or stopping plugins), it’s not normal. It is most likely caused by some unnecessary security settings, which you can find and turn off in the server provider interface(cPanle). Otherwise you can’t do anything. https://www.dropbox.com/s/m9cjv23vsw9dunj/WX20230223-081606.png?dl=0
I have reviewed your WordPress site once more. After deactivating certain plugins, the 500 error no longer appeared, and I was able to successfully import the template. I also created a new page at https://www.magnuslong.com/?page_id=847&preview=true and it seems to be functioning properly.
Kindly attempt accessing the site again. If you continue to experience issues on your end, please provide me with additional details, such as the specific template that is causing problems.
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