This is my first Airwaysim world after a week in Beginner's World. I made a comparison between your and my airline (Phosphor Ion Bird, Perth, MT6) and it seems Schro has quite some good tips that might make your airline more efficient and also bring your LF over 70%. Another thing to watch is the way your fleet is built up. You have 35 planes over 6 fleet types. I have seen worse, but I wonder about your plans behind the A320/MD-80 aircraft? If that wasn't part of a replacement schedule for your MD fleet, it could be wise to stick to one plane for each purpose. Same for the Fokker 50 vs CRJ100s you have, if you need the range of the CRJ100s, it might just be cheaper to have a few more CRJs to serve the short routes (even though the Fokker props are more fuel efficient) and stay away from adding yet another fleet type. With 3 planes, I wouldn't be surprised if they don't cover the fixed costs for their fleet type.
The single Boeing 737-200Adv and DC-9s you have also really hurt your fleet commonality costs - you pay 15% of revenue on fleet maintenance, I pay around 5%. I admit I fly only Fokker 70/100 and A320 family, but still, you could save a lot of money. Now, you said you don't have money to get rid of the planes, and you're are already 18 million in the red, so maybe starting over is not such a bad idea. I have noticed patience is key in the starting phase!