Wrong Skillset and Greed
Never put people with no international experience in charge of an international airline.
When Jimmy Bow Tie came to Qantas he got rid of all the experienced Qantas personnel and replaced them with his mates who had zero experience.
Result: the mess you have now.
Wrong aircraft
Old Aircraft
Declining Service levels
Disengaged staff
The Leprechaun doesnt have a clue how to fix it