Trigger rate
Why it matters for creators
Trigger rate is the earliest place a DM funnel fails, and the least examined. Everything downstream can be perfect while most of your engagement never enters the funnel at all.
A low rate almost always means a keyword mismatch. You asked people to comment GUIDE and they commented "guide please", "GUIDE!!", "send guide", or they read the caption, wanted the thing, and simply commented "yes". Case is usually handled for you; punctuation, extra words and plausible synonyms often are not unless you add them.
The number only makes sense against a like-for-like denominator. Dividing triggers by comments alone reads above 100% for anyone also running story-reply or keyword-DM automations, since those fire on engagement that was never a comment. Counting every inbound event on the bottom keeps it honest, and it can never exceed 1 because each event fires at most one automation.