My best suggestion would have to leveling up a dol namely botanist or miner. If you have plenty of leve allowances saved up then it'll be better. It took me a few days to level my botanist to 50.

Check the mb to see whats selling. You'll make a profit either way since you don't have to buy mats to make stuff.

Another tip would be refining those mats. Ex:botany+carpenter= lumber or miner+armorer=ingot

For the most part mats sell at a higher rate than the finished product