Yeah, I totally agree with the elimination of temptation. And I would take it one inch further, which is **eliminating all the "small decissions" from your life. **
Like if you are tired and you know you won't make a good decission, have a default one that you will go to that you decided on when you had willpower and good energy.

For example, let's say you want to buy something but you don't know if it's the right thing and you are tired. So your default decission could be not to buy it if there is some time pressure like marketers use

"Buy this now because we will close this deal forever and you'll never be able to give us your money, because obviously we want your money only now, not later ..."

And another thing I use, which goes a bit against your "great long-term results" is to take it the opposite way and imagine the cost of inaction.
That's why I'm a huge fan of stoicism and challenging yourself with it