Heya! Turnip Market is a great way to boost your fortune in Animal Crossing. You should look into using turnip.exchange it's a great site that allows folks to host their islands for a myriad of reasons. I usually end up selling my stalks for 500+ each week using that service. In fact, since I started tracking my turnip prices and my sell at rates I've profited over 37 million bells. (To be clear though that's since April, only taking a couple weeks off to time travel while I worked on my island)

I thought you were talking about a legit farmers market

That would be fun too if I had the time and space for it. xD