zunkadds
I still can't access cPanel on your hosting so I use Akeeba backup to take a backup of your site and check on my localhost.
Firstly, I switch to PHP7.3 and see error right on homepage.
Then I made a test by switching default Joomla template (T3 Blank) to Protostar - standard template of Joomla: https://prnt.sc/qqtzdn
but the same issue happens.
Which means that the error doesn't come from T3 Blank template, maybe one of your 3rd party extensions is not compatible with PHP 7.3. You can disable them one by one to see which one caused issue.
You can try the same on your site.