Given the vast amount of duplicate questions on the site, I think the related detection logic and display needs some updating to make the question asker as aware as possible of their existence, especially the "top rated" answers.
A bold colour and placed at the top for the canonical type or top rated answers would be a good idea.
If there is almost exact match for 1 or more questions, and the user has not visited those pages, then maybe a popup with the matches displayed and a message such as "we found these previous answers - please check to see if they answer some or all of your question before posting" could be an idea.
If the user does decide to ask a question, a text input related hints/tips/suggestions box underneath the question input might be a good idea too.
For example if the user types "power supply", the box can display hints about how to ask the right question (e.g. mention DC/AC, power rating, voltage, etc)
If the user enters "a relay", then hints can be "part number? datasheet link? coil rating? switch rating?" or something like that.