Find the thread it already uses
Ask the question the way a buyer asks it, not the way your headline is written. Note any Reddit link in the answer or in the sources. Open it. If the top comments are thin, a specific, dated, first-hand answer can sit next to them. If the top comments are already excellent, adding a pitch underneath changes nothing.
What the comment has to contain
A constraint, a result, and the name of the thing only if it belongs in the answer. 'We increased trial starts' with no context is an ad. 'We switched off a shared inbox because two people were replying to the same lead, and a one-seat tool was enough' is the shape models can quote. The long guide on getting cited walks the same idea with the failure cases.
Recheck the question every few weeks. The cited thread changes. Karmy is for showing up in the new threads while they are still young enough to earn the spot.