join an alliance and ask the big guys for planes at 50% their value.
as long as you are determined to succeed, you can. i did myself
i joined w10 about 2 months ago and now i'm a big guy (currently ranked 11th). try routes that are less competitive, and planes that are cheap and affordable, yet profitable
try using atr 72-200s as they are cheap and profitable. don't worry if the big guys are ordering airbus a319s as they aren't really profitable at all, and are wasting their opportunity cost buying them.