My new favorite Youtube channel is The Stoic Body. I especially love his video on motivation.
https://www.youtube.com/watch?v=TLfiK6R8O9E
His advice that we should find motivation by “focusing on what is really important” is very similar to modern, scientifically backed methods of motivation, like those I have written about: “When I was kicking cigarettes to the curb, occasionally temptation came knocking. When that happened, I would always think about how I wanted improved health and sex appeal more than cigarettes. This technique can be applied to any situation: find the motivators, the things you want more than the bad habit, and remind yourself of those things.”
P.S. He’s also got a video on breaking bad habits here. which nicely summarizes the advice from the scientifically-backed self-help book The Power of Habit.