Some things I usually work on gathering (I am only currently up to Level 37 however):

- Gridanian Walnut (used in making Walnut Breads)
- Walnut Logs (used in carpentry)
- Oak Logs (carpentry)
- Midland Basil (used for making Knight's Breads)
- Midland Cabbage (used for making Buttons in a Blanket, and Stuffed Cabbages)
- Button Mushrooms (used for making Buttons in a Blanket)
- Pearl Ginger (used for making Mulled Tea)
- Millioncorn (this used to sell well, back when triple crafting leves were popular, since they were an ingredient for Cornmeal. Since the nerf to triple crafting leves, nobody has bothered with Cornmeals, and so the price of this item has dropped)
- Desert Saffron (used for making Buttons in a Blanket)
- Flax (used to make Linen Yarns)

Lots of stuff you can gather to sell, just gotta look up the marketboard for items you can gather in your level range, and see which sells well. It especially helps if you know what each item would be mostly used for. For example, stuff like Dragon Pepper wouldn't sell that well, even if they give you more EXP per swing, just because people don't use them in general.