(It can be a tangible or intangible takeaway)
Do you have a merch item that can be "a call to action"? This "CTA" merch item should be something different and out-of-the-box - separate from a normal T-shirt, hat, etc. A "call to action" item isn't a must, but having a tangible item that your audience can take with them to remember the message you shared during your performance can be VERY impactful.