There is a lot of ways to make money, it really depends how badly you want to do it.
Aggressively play the market, this is the #1 way to get rich and always will be.
Craft Nems/Slaves with valuable affixes and sell, risky but another good money maker.
Buy AC and sell premium items. The classic whale route, guaranteed you'll make bank every new scratch.
Alts, alts and more alts...oh and something called weekly missions/peitro etc.
I want to caution that unless one really has the dollars to throw away, it's best to limit the use of #3 to the purpose of obtaining initial capital for engaging in #1 or #2.
So either use #3 or #4 for the initial capital, then start doing #1 or #2.
The nature of inflation is that #4 will only get you so far. Sooner or later the dailies and weeklies are going to be worth so little it feels like a waste of time, even if you're really efficient and spend only 10-15 minutes per week on each alt (3-5 minutes a day for 2-3 days per week per alt).