Hi {{first_name}},
Your team has been running [[current use case]] with [[your product]] successfully. Teams who do that often find [[adjacent product or feature]] useful for [[adjacent outcome]].
Here's how it connects: [[1-2 sentences explaining how the cross-sell complements their current usage]].
The setup is lightweight since you're already on [[your product]]. Would it be worth a quick look?
[[Your name]], [[your company]]