There is only only one motivation, ever. Actual desire.

In short, these articles exist because people are trying to rationalise their way past the cognitive dissonance of wanting to want things, without being willing to actually change themselves.

Decision making is fundamentally a process of "I want, there is no greater want, I can, so I will". If you're not getting to do what you want, it's simply that you have a greater want. Sometimes that's just a want to not actually exert effort.

tl;dr - you will not change what you do without changing what you are.