No issues!
Try to troubleshoot by finding the problem.
As you see an only blank page, do the checklist one by one.
1. check the PHP version of your older server and newer one.
for that, create a new PHP file and write
phpinfo();
?>

execute the code on both servers and you will have a lot of info about both.

2. Check the config file and verify the database connection is established properly.
for that create a new PHP file and use simple database connection test code.
function OpenCon()
{
$dbhost = "localhost";
$dbuser = "root";
$dbpass = "1234";
$db = "example";
$conn = new mysqli($dbhost, $dbuser, $dbpass,$db) or die("Connect failed: %s\n". $conn -> error);

return $conn;
}

function CloseCon($conn)
{
$conn -> close();
}
?>

I hope this will help you.
PS: don't forget to use CloudFlare to prevent server level attacks on your website ( https://www.experthoot.com/protect-site-from-ddos/ )
Thanks

That's the theme is really awesome
You can use it either in your office website or your blog
Its also have all the accumulated data for your site via this you can make your website simple and in the meantime its looks really cool also.
Thanks

First of all, I say to you A big thank you
I have been waiting for this from too much time and now I got it via Xoops it's really awesome to have these that's really cool
Thanks for doing this and makes Xoops ahead.

Hey
As I understand you face an issue with your MySQL
so you have to first upgrade your MySQL if you already upgrade that then you have to follow this
You have to go in the admin panel, Then see if any blocks there then you have to click -> blocks,
Remove all the blocks
the same After that I hope your website works.
Thanks

Hello
As I understand you have an error of 500 on your website
So I must say to you there is an error in your index.php check that There is a problem in your index.php page you have to make a backup of your index page and then make a blank page with the name of index.php if the site run there is a problem in your index page
The errors are some you don't define some of the keyword right ways to check that and then run your file
Hope this will help you
Thanks