Just to add on, don't scare to fly short routes with competition. Get some props like Fokker and you'll always win the market share.
Dump those jets! Yes they fly faster but the speed is not significant if you are flying short distance (100nm~400nm) routes which is the most profitable for you, and yet they burn a lot more fuel.
Get your fleet on ground overnight because short routes won't make profit between 2300-0500. If you fly them during midnight, the overhead cost might turn you down.