Ronstar, here is my short answer
Alot of pre-hunt research, attention to detail on determining what sites could still hold some deep targets, the willingness to get up early on weekends, walking and driving a lot to those sites, pre-planning out my site route to make the most of the day,
Learning my machine well and figuring out what settings work the best at my sites to get the most out of it,
Having faith in my detector and instincts, a ton of patience; to not give up right away at a site that appears to not have anything, even though my research is telling me there could be something old and deep there.
I always have it in the back of my head, even if I don't find anything here, I am still getting exercise.
Also, a love of the hobby to be willing to do all this. Since I started detecting over 20 years ago, I have knowledge of hundreds of public sites that I have hit in the past and have an idea if there could possibly more targets left at them.
Since I have saw so many public sites in different stages of 'number of remaining targets', that helps me gauge pretty well if I have a shot at finding more at a certain spot.
Dave
You never fail to amaze us with your finds. Is it luck or is it talent? Karma? I dont know but you should start a tutoring class and count me in as a first to sign up!