The lesson
Make the ad's pain a three-word scene a buyer has lived, and put what it costs in the caption under it.
The first card is a photo of a man with his head in his hand at a restaurant table, stamped "YOUR CARD DECLINED." in condensed white type inside an orange border. The caption underneath reads "The wrong limit costs more than the deal." The post copy opens "You're closing a deal, not managing card limits."
Don't copy the 'get Brex AF' line or the orange frame. Keep the photographed moment, the oversized caps, and a caption that states what it costs.