Subject: Hi {{first_name}} / closing the loop

Hi {{first_name}},
I’m bummed we haven’t been able to connect, but I wanted to give it one last shot.
Would you be free to hop on a 15 to 20 minute call [[date and time]]? I guarantee that I have a few suggestions that could [[improve KPI]].
In the meantime, here are two resources I thought you might find value in because you’re on the cutting edge of the [[niche/industry]] industry.
Hope to hear from you!

[[your name]]