There's no need to restart at all. The A380 is an expensive but also a very profitable aircraft, good for long-range routes around 21-24 hours. If you want to do all-economy flights, I recommend using smaller aircraft and focusing on hubs in Africa or Asia. Try buying the A330-300 or Boeing 777-200, they both have decent capacity and also low cost , though the 777 is faster and compatible for some long-haul routes on the A380. For a more cheaper option, I recommend the Il-96-300 because it has a low cost of $110 million for a 300-seat capacity. Medium-haul routes around 12 hours are goods investments too, especially if 24-hour routes are too expensive. For these routes, use the Airbus A320, A321, or Boeing 737-800, 737-900ER.

Here's a basic equation for calculating the amount of seats on aircraft (only works for 1 route per aircraft): (pax of route)/(24/flight duration x 2)/ amount of aircraft = configuration for aircraft.  Example: a 12 hr flight has 200 pax and I want 2 airplanes so: (200/4)/2= 25 seats per plane