Gold RB Argentina is a good filter that has really low competition purely because you’ll only be making around 300-600 coins per card depending on whether you choose to list for the cheapest buy now or list for 200-300 coins higher and sell to lazy buyers. You’ll be picking the cards up for around 400 coins and listing for 700-1000.
Similar to the argentina one above. Low competition because of the low profit per card. Similar prices as well. You’ll be picking cards up for around 400 and selling between 700 – 1000.
Gold LB France is another low competition filter where you’ll be picking up a lot of different cards for around 500 coins and flipping them for between 1000 and 1200 coins.