Installing Drupal

I working on a migration from Drupal 7 to Drupal 9. The issue I have is the hosting provider doesn't allow a change to docroot so using composer to install to domain.com/web isn't an option(At this stage, assume changing hosting is not an option).

Hi, I am a noob so please excuse what may be very silly questions & I read all the documentation I could find.  I also looked for a Drupalvm specific forum but couldn't find one (no recent replies on the youtube vid).

My current plan is to use Drupalvm which "will install the following on an Ubuntu 18.04 (by default) linux VM" after I install Vagrant, Ansible, & download Drupalvm.

I have installed D9 via Softalicious on SiteGround

When I Admin/Configure/Basic site settings, I get an error in plain text

The website encountered an unexpected error. Please try again later.

Everything else seems OK

I’m attempting a fresh installation of Drupal 9. My web host has PHP 7.3, but I do not have MariaDB 10.3; therefore, my understanding is that I’ll have to use the provided driver. Except, I’m not understanding where in the directory I need to copy the extracted files. The path laid out in the driver’s page does not match the directory structure I’m seeing in my Drupal 9. This is the error message I am currently seeing before attempting any installation of the driver:

This page isn’t working

example.com is currently unable to handle this request.

HTTP ERROR 500

In the documentation for installing Drupal 7 - https://www.drupal.org/docs/7/install/step-1-download-and-extract-drupal - there is a bullet point: "using composer".

Clicking on that link takes one to this page: https://www.drupal.org/node/2718229. It tells you to use this command:

composer create-project drupal/recommended-project my_site_name_dir