How can I have my question answered by the right person on Quora?
Lurk in a topic for a little while. Go through the list of most viewed writers, and check whether they look like they know what they are talking about.
When you A2A, go to the View More menu, then go to the relevant topic, and pick not the first people that come up, but the names you recognise as knowing what they talk about, and failing that, the names with the most answers in the topic.
You can’t find a relevant topic? Then for pity’s sake, go back and tag the right topics on the question. That’s actually step 0.