So I have a new airline in MLE. The only profitable longer route is MLE-Colombo airport. Where should I expand, because i tried a lot of airports like Bangkok, Beijing and Dubai route as well, but they had max 5 passengers. I already have enough domestic routes, so i want to expand but i simply cant
Tough one, did you try Saint Denis de la Reunion, Mauritius, Seychelles? Should try IST, JNB, NBO, HKG as well I guess.. Good luck!
I once had an airline there, flights to DXB and KUL were making me lots of cash.
EDIT:
Seems like you're already flying those airports...
Yeah I will have flights there but they are empty 
I will stry those islands
The problem seems to be that you don't have any IL-partners, try to interline with someone from your destination.
Also cut down on the airplane types.