If you want to sell things on market board, I would suggest leveling weaver and leatherworker so you will be able to craft glamour gears. Some look really cool and they could sell from 30,000 gils up to 400,000 gils depends on the demand of the community. If you want a more consistent income, I'd suggest leveling all of the DoL and DoH to gather & craft mid-tier materials (either normal or HQ). Some materials need mob farming which doesn't give you much, and they aren't sold in Tradescraft Supplies NPCs, but they can be crafted easily so I would craft a lot of them and sell them at a reasonable price.