When trying to design your lifestyle, perhaps as part of FIRE, there are many considerations. It will take some effort to be intentional about creating the lifestyle you want. Over time, having a solid routine will look like a life hack from the outside.
By creating and sticking to a routine, you can create momentum. Let us imagine you are in a funk. You are not getting anything done. The first thing to do is to take the first step into something productive. Anything productive. As you build momentum on positive items, you will likely naturally start seeing yourself having more energy and more ability to focus.
Since we have limited resources of time and attention, choosing what we want to focus on is an important aspect of lifestyle design. The Eisenhour Matrix describes a scenario that is important to intentionality. Eisenhour states that what is important is usually not urgent, and what is urgent is usually not important.
The basic theory is that if you can get so much accomplished in the first hour of your morning, that momentum will carry on throughout the day.