Good article. Simple and easy to follow. I like it. I would add two things that are probably implicit in your thinking.

First, your planning timeline might be three months, but you probably have goals that are further in the future than that. These need to be taken into account. Does any aspect of them need to be included in your planning timeline?

Second: you might plan three months in advance, but you will need to review that plan well before the three months is up. Depending on your work and life environment, this could be monthly, weekly, or even (though I hope not!) daily. And at some point your review probably needs to be more of a re-plan exercise.