There's multiple markets on sythe where you can make money besides gold selling:
* GFX
* Any game services
* Selling programs (if you know how to program)
* Selling guides
* (Re)Selling game keys or game time
Outside of Sythe, I'd mainly go with:
* Freelance work
Pretty much what they said below,
As I'd like to be more specific I'll add onto the great suggestions below.
For Ebay/Amazon you could do flipping/Dropshipping or just start selling your own stuff.
For Consultation, you could create a simple website regarding a niche.(don't be broad, start small and expand)