Do you know why your best post worked, or are you guessing?

Not a survey, I am actually trying to settle this for myself.

Every so often something I post does two or three times its usual numbers. I always have an explanation ready. I am less and less sure the explanation is true.

For the posts that worked best for you: hook, format, timing, or topic?

And the part I care about more: did you manage to do it again deliberately, or did the next one land back at baseline?