Beautiful, clean produce attractively displayed in abundance draws customers like crazy. Top quality and flavor bring them back week after week, year after year. Little bits of this and that don't have the same appeal. Better to concentrate on doing a bang up job on a few items than to have little piles of fifty different things. Now don't laugh in disbelief, but I get the biggest crowd at my stand when I pile big bunches of carrots, radishes and beets together on my front table at market. They sell better than vine ripened tomatoes! Go figure. Display is everything. Draw their eyes with color and abundance.
Don't sell cheap. Customers are mostly willing to pay well for good stuff. You don't need the customers that aren't. Its better to grow less and sell it for more than to grow lots and sell it cheaper. You work less and make the same amount of money. Don't under sell the other farmers. You don't need to compete with them. If you all keep your prices up the customers will pay it and you will all make enough money to make it worth your while. Our market prices are well above supermarket prices. Folks know the difference in taste, quality, and nutrition and are willing to pay more for the good stuff.
Do keep your veggies sprayed down with ice water so they stay fresh.