Gamification: Engage and Excite: Wheelio? Turn Wheel? 😴... Try not to be "a shop on the web", however all the rage. Energize one individual and they'll need to pass it on.
Email Popup with Exit-Intent: Pops up at cruicial parts of the client venture (leave purpose, scroll-%, ..) and gathers email right to Shopify, Mailchimp or Klaviyo.
Emotions + Urge = Conversion: Just won the rebate and still in the surge of feelings? Euphoric clients who won a terminating rebate are practically sure to purchase!.