Do you have challenge log unlocked? That's some easy gil right there. Also doing roulettes as a tank when they're in need nets you some cash, though if you're looking to change jobs that might not be as much of an option. Doing your centurio hunts gives money too, not a lot but it builds up fast if you do them daily. Can also just check your server's market board and see what mob drops people are using for crafting that you might have access to. Those are all easy peasy battle class related ways to make some coin.

If you level your fisher to 66 you can get start getting gazelleskin maps to sell or use to try the new Aquapolis too. Both are avenues for more money.