Set an asking price that attracts buyers and still pays you well.
Open the Market page and compare asking prices for your crop in your district and nearby ones. Prices change by season, so look again before every new post.
Clean, even produce deserves a higher price than mixed lots. Large quantities can carry a small discount per kilo, which helps wholesale buyers decide faster.
Add fertiliser, labour, transport and packing, then keep a margin on top. A price below cost only helps the buyer.
If rain, a holiday or a nearby harvest moves the market, edit your post. A current price brings more calls than an old one.