80-85% net winning percent. Should I move on demo?

Frankly, do such strategies even exist?

This is what I thought for years, because most people in the forums are repeating these kind of statements over and over (me including).
A high winning percentage is definitely possible, but of course not the only way to trade profitable. As you said, consistency is much more important, but a lower winning rate is also more difficult to handle psychologically.
This screenshot is from a (small) live account showing the last 100 trades. I only take one trade per day on average, but there are days when I'm not able to trade because of my main job.