Prospects want you to be straight forward. Ensure them this is the last pitch and then rephrase the opportunities you could provide the team one last time to cement them in the prospect's memory. Back this up with a case study to demonstrate success. Tell them you'll be reconnecting in a few months so they expect another email from you in the future but don't shy away from offering them one last trial. Remind them you'll keep an eye out for their company because you're not finished with them just yet – showing determination and validation that you believe this is a good fit.