How to downgrade the PHP version 7.2?

I have the PHP and Perl code hosted on Bluehost. It worked well till 3 months ago, but some features don’t work recently. I think it is the PHP version problem. I have checked the Bluehost, there is an option to upgrade the PHP version to 8.1, 8.2, no option to downgrade to PHP 7.2. Any suggestions?

I checked the code and made some changes to get it worked as expected. I expect to get it working well as before.