Hello,
1) Do you have any errors in the server error logs? Could you, please, provide us with the server error logs and also with the FTP access to your site because you did not provide the URL to your cPanel.
I see a lot of errors in console https://prnt.sc/26h1ny6
So, it looks that something is blocked from the server side.
2) This code was the reason of the issue https://prnt.sc/26h1e34
I removed that.
3) I have added custom code to child theme style.css. Check the titles now.
Regards