I have spent my entire life frustrated with the reality that none of this advice actually works for me. This is because motivation was never my problem to begin with: my problem is "executive dysfunction", which is very counterproductively titled ADHD.
Well think of this: if you knew there was $100 million in a dufflebag of gold at the bottom of a pond, would you learn how to put on scuba gear and retrieve it?
Perhaps you don't have compelling enough reasons to do things.