Have you carefully optimized your route network, getting the most out of every plane you have?
Are you charging for food and bevs? Especially as a startup, this money can make a real difference.
What's your hub situation like? If your mates are at less-competitive bases, they might have less competition and hence be able to make more profit on their routes.
Don't bother leasing out your planes or brokering if you're looking to raise money; the quickest way to get money is to buy planes and put them into service.
Also, don't save up for days trying to get a 737 or other big plane... instead, buy more smaller planes like Fairchild-Hiller FH-227s or Fokker F28-3000s. While you're sitting and saving, other airlines are launching more new routes and building their DOP quickly.