How can non-clickers be separated into forgot-to-click, low-interest, and needs-help types?

You cannot know the exact reason someone did not click just from the non-click itself. A safer approach is to use link-click data as one signal, then send a helpful follow-up or review replies manually. Some people forgot, some were busy, and some may have had a question before taking action. The follow-up copy should invite a reply rather than pretending the system already knows their intent.

A Good Follow-Up

Try wording like: "Just checking that you got the guide. Here's the link again, and if anything was confusing, reply here and I'll help." If they click, reply, or ask a question, your team has more context. If they stay silent, treat that as a weaker engagement signal during your later review.