Focus is a skill. You can improve it.

The boring advice from grandma are bigger levers than most credit. Simple meal prep, e.g. cook a weeks worth of protein or simple ingredients to stock the fridge to easily combine for a consistent targeted meal plan that hits most nutrition boxes. Every hour of sleep before 12am counts for two hours of rest. Waking up and getting outside for sunlight early, sets the anchor for when your body feels sleepy 12 hours later speeding up how fast you fall asleep. Exercise. Some form of aerobic development a few days a week, some form of weight training a few days a week. As a habit consistently these tend toward healthy bf % which one of the unstated benefits is deeper focus and more often waking up with that rare clear minded focus on tap, most days. Any caffeine or adderall or other nootropics only push an additional 2% beyond this base of the boring advice from grandma. I hate it. It works.

Every activity requires energy. Willpower takes energy. With prioritization focusing on those activities that give more energy means getting more done. Focus feels effortless when you have energy. Feels like pushing a boulder up hill when you don't. Generally early in the day when energy is highest feels easiest for focus activities. In many professions you hear the repeated story that those in senior positions who made it tend to be those that would wake up each morning and read, practice skills, exercise before core class or work hours. They used their highest energy of the day to those things that moved themselves forward first. Then performed their other tasks of the day second when energy was lower.

You can structure simple systems and organize your life around them to make things feel effortless. In any complex system is a simple system that scales at its core.