To follow up on what Howard has said, I think that you have two lines in config,php to worry about.
$CFG->wwwroot = 'https://www.rjerz.com/moodle';
The above line for you should be 'https://myawesomemoodlesite.com"
$CFG->dataroot = '/home/your_user/moodledata3';
This line should probably stay at where it is.
In my lines, you will still need to adjust these for your particular server and moodle installation. Don't take my lines literally. For example, I have named my moodledata folder moodledata3. Yours might be different.
Had your moodle been working before you tried moving it to a subdomain?
