Sell sex for ancient currency.
More realistically, and what will keep you liked is find a linkshell like mine. If you're an avid attending member, depending on what stage you're on, they sell you relic currency at discounted prices in exchange for points. 300k and 25 points (15 points per run) for a Jadeshell is pretty damned good.
All the while you can keep fishing to buy the discounted, and the bazaar'd ones. A relic is a huge investment, there isn't a fast way to get one for 99.98% of players. Just keep at it, slowly but surely.
My friend is making serious gil doing ZNMs also. His shell is your pop, your drops...and a T4 on my server can drop upwards of like 9mil on good drops. So there is that. Just takes time man. Good luck.