You (Hook)
"Hey [Name], it is [Your Name]. We talked about [topic] back in [month]. I am not calling to pick up where we left off -- something new came up that made me think of you."
Them
"Oh hey, yeah -- sorry I dropped off. What's new?"
You (Problem)
"No worries at all. I just saw [relevant trigger event -- industry news, their company update, market shift]. When we last spoke, you mentioned [their original pain point]. I am curious -- is that still a priority, or has it shifted?"
Them
"[Updates you on current situation]"
You (Bridge)
"Got it. Since we last talked, I have seen [new development, case study, or solution update] that directly addresses that. I think it could save you [specific benefit]."
You (Close)
"Would it make sense to block 20 minutes this week so I can walk you through it? I will keep it tight and you can decide if it is worth going deeper."
Pro tip: The key to re-engagement is leading with new information. Never restart a stalled conversation by saying "just following up" or "checking in." Give them a reason to re-engage.