I actually answered a question like this not long ago so I’ll just copy and paste my answer lol
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Good customer service (not staying on your phone, talking and engaging with people, etc)
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Have everything priced fairly (Don’t undermine your work!)
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Make things that are affordable as not everyone carries bills higher than 20s and some don’t carry much change (unless of course you’re doing it digitally)
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Perhaps have your items in containers and one item of each you intend to sell on display with price as to minimize bacteria/germs
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Not really needed, but it might be nice to have a bottle of germ-x on the table for people to use
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If you intend to sell things with safety eyes, chenille yarn, etc perhaps have it noted somewhere whether just for yourself to mention or a little paper to give saying how it can be a chocking hazard for kids and that chenille yarn sheds, etc (maybe even a step further and mention if the yarn used is machine washable, etc)
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Having display stands or just displaying things nicely where everything is noticeable would make it look more pleasing to the eye
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Seasonal and functional items might sell more but just sell what you want and take noticw around you what people bought and for how much for reference for next time or to even just sell online
If you want even more tips I’d recommend going to the community tab and using the magnifying glass (in the community tab not the shop one) and searching anything with market, market tips, craft fair, craft fair tips, etc, Here’s the original post I answered too as I believe there were other great answers!
Good luck with your market and make sure to safe safe and well!! 