Great video!
I often talk about consistency, because that's a big factor to climbing rank. I also like to follow the "2 Loss" rule. If I lose 2 games in a row, I'm done with ranked for the night - or extended break.
Also this article is fascinating!
https://towardsdatascience.com/analyzing-tilt-to-win-more-games-league-of-legends-347de832a5b1
Basically if you do lose a game, you should take a 5-20minute break. At least in their data it seems to increase your win rate!
Again, great video and I agree that consistency is a less talked about topic.