Just installed the theme, updated my PHP version to 8.3, site is broken?

Hey all! I'm impressed I managed to break this thing so quickly. This is a new record.

I just switched from an old theme (Dante by SwiftIdeas) to Betheme, and on my Bluehost interface I saw that I had an old PHP version running, 7.3. So I thought I would update it to 8.3, since I now have a brand new theme. The second I did this, my website locked me out.

I've disabled all themes, disabled all plugins through my cPanel File Manager, but it still gives me an HTML 500 error when I go to my website aetheric.org, as well as when I try to log in to wp-admin.

Been looking for a way to roll the PHP back to 7.3 so I can get back into Wordpress and see what the issue is, but it seems weirdly impossible! No one has a good answer unless I splurge for VPS hosting so I can access WHM. Otherwise cPanel only allows PHP 8 options, not 7.

So my question is, does anyone know a way to force cPanel to use PHP 7.3? It doesn't list this as an option in MultiPHP Manager, so I'm unsure how to do this. Otherwise, any idea how I can regain access to my Wordpress site?

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