Is there any footage of a very highly skilled Symmetra?

I want to get better at playing Symmetra but I cannot find any videos of good players where I can learn stuff. I would like to learn good sentry placement on specific maps and how to get more hits with the alternative fire. During one game defending as Symmetra I did 11,000 damage and had 37 eliminations, I can never seem to do that well anymore, maybe that was a low mmr game?