Yeah i am so happy for you. I was succesfull at Melbourne. But now there are nearly no Slots anymore. For one Connection I pay about 800'000$ just for Slots. I think ok, lets invest that. But after several weeks of operating that route i still have loadfactors of 30%.$
That leads to NOTHING. I will bankrupt now and start over in 255 years when the next game world starts.
Still an ok number of slots left, and your airline looks small but profitable. You can use that cash for bigger planes, use existing slots to start flying LH. You'll be able to open another base soon, too.
If you want more profit, easier expansion, you need to make better choices about which routes to fly. 20 times/day to Sydney, and the sydney slots will also be quite expensive. You could dump half a dozen of those and probably have similar total pax numbers. Once to christchurch, where your best case after RI climbs is about 50 pax/flight, not much more than 30%. But only twice to Perth, not at all to gold coast, canberra, launceston, all routes that will offer a much better return.
You're declaring things to be impossible, leading to nothing, far too early, and incorrectly. From where you are, there's no reason you shouldn't end up #1 for marketshare in melbourne.
And if you want a less challenging airport, there are still plenty that are excellent places to start in. e.g. Vienna is practically empty, you'd be competing only against two other brand new airlines. Lisbon is near empty. Washington has a bucketload of slots. So does San Francisco. Pittsburgh is completely empty.
Fair enough if you want to quit because it's boring, etc. But if you're BKing and quitting because it's impossible to grow large, impossible to start now and become huge, you're wrong.