I think it’s a shared server.
Searching for more info from info.php, I found this:
memory_limit 1024M 1024M
First number is LocalValue and the second one is MasterValue.
Has PHP already the memory limit I need?
Even disabling all plugins and switching to default theme, I got some fatal errors:
Fatal error: Allowed memory size of 1073741824 bytes exhausted (tried to allocate 20480 bytes) in /home/studyaustralia/public_html/wp-includes/wp-db.php on line 1972
Fatal error: Allowed memory size of 1073741824 bytes exhausted (tried to allocate 20480 bytes) in /home/studyaustralia/public_html/wp-includes/class-wp-fatal-error-handler.php on line 65