Free delivery is the most effective offer most shops have.
SETTING IT UP
Add Free shipping as a method to a zone, with a requirement: a minimum order amount, a coupon, or both.
CHOOSING THE THRESHOLD
Set it above your average order value, so it encourages a larger basket rather than giving away delivery on orders you already had.
If your average order is 15,000, a threshold around 20,000 gives customers a reason to add something.
TELLING CUSTOMERS
Say it in the header, on product pages and in the cart. A threshold nobody knows about changes nobody's behaviour.
Show how much more is needed to qualify; plugins do this in the cart and it measurably increases basket size.
THE ARITHMETIC
Delivery is not free; you are absorbing it. Check the margin on an order at exactly the threshold. If that order loses money, the threshold is too low.
ALTERNATIVES
Free local pickup, which costs you nothing Free delivery in your own city only, where you deliver yourself
