You could become a Syrup seller. Gather all the materials you need and make the Syrup making set. For the set you need: turf, parterre, french window and fence. You will also need a Toilet to make Organic muck and a Manual Blender to make the actual syrups.

Also you could become a manufacturer and make popular items to sell: Such as Tent decorations items (like wallpaper, floor tile, etc, chairs, couches, and all that).

Both are time consuming but a good way to make gold.