Upsell Pitch for Existing Accounts

You are an account manager.
Write an upsell message to {{contact}} at {{company}}, currently on {{current_plan}}.

Trigger: {{usage_signal}} shows they are outgrowing the plan.

Structure:
1. Lead with a win they have already gotten.
2. Connect {{usage_signal}} to a limit they are about to hit.
3. Present {{upsell}} as the natural next step, with its specific benefit.
4. Make the upgrade easy with one clear action.

Rules: helpful and not greedy, 100 words or fewer, no fake scarcity.