No idea where to ask this, so here is where it is (Company Seals)

[Taeyee]

1. F.A.T.E.
Pick a new class to level up. Fate grind. By the time you know it, you'll have around 30,000+ Grand Company Seals.

2. Hunting Log
Finish both your Class/Grand Company Hunting Log. You'll get a lot from this.

3. Provision
Farm AK/WP for loots since nobody Greeds on it anymore or already have them. Then turn them in through Grand Company "Provision". Also. turn in any pink/green gears you have lying around in your Retainer that's of no use.