How can smaller companies discover what messaging/narrative really resonates?

When I was at a small startup we would use email subject lines, webpage copy and CTAs, and paid media banners to test our message. It's a quick and cost-effective way to A/B test what resonates with your customers.

You should also always talk to your sales teams and see if your message/narrative resonates. They are the ones talking to customers all the time, and should be able to gut check what would resonate.

And last but not least, talk to your customers! Customers are your best message testers.