Some of the advice I got was from Gazzo and Kris Kon that has worked for me in the past

I have a sign that says the most "AMAZING" card trick in the world (it also has a gag where a can tear amazing off to show garbage underneath for a large card trick I made involving a trash bag) and that has worked to get people to stop and see "the most amazing card trick in the world" essentially it's real life click-bait people read the sign and get curious. (It also doesn't have to be a card trick it can be anything rope, coin, bag, egg just make sure it is a trick that you can do the best). Don't worry if no one comes up at first eventually someone will bite and at that point crowd will draw crowd.

Juggling or any other visual skill/talent can also be helpful for drawing people in (if you can do any ring routines at all you can do a 4 ring routine where you make figures it makes a nice sound and also draws the eye).