A real limit — few seats, a closing date, a capped batch — is one of the strongest reasons a hesitant buyer will finally act. Without a reason to move now, 'later' is the default, and later almost never comes.
Real scarcity is information
'Six spots left' or 'closes Friday' isn't a trick when it's true — it's a fact the buyer needs to make a good decision. Use the genuine limits your work already has: your time, a launch window, a real batch size.
Fake scarcity costs you everything
The fake countdown that resets, the 'only 2 left!' that's never fewer — buyers notice, and the moment they do, they stop believing anything else on your page too. Manufactured urgency buys one sale and loses all the future ones.