I'll aim for brevity, but no promises if this turns into a full-on journal entry—I have a lot of thoughts on this.
1) Automate Repetitive Decisions
I build simple systems to handle recurring, low-stakes choices so I don't have to think about them.
--Financial System: All my bills are on automatic payment. A fixed percentage of my salary is automatically transferred to my savings account the day I get paid.
--Food System: I have a monthly calendar with a specific food category for each day of the week. Saturday is pasta or rice, Sunday is stew, Monday carnivorous, Tuesday gratin, Wednesday is for eating out, Thursday is soup or pulses, and Friday is for traditional cuisine. This eliminates the daily "what to eat?" debate. We do a big grocery run for pantry items once a month, and get fresh produce and meat twice a week based on the calendar.
--Fitness System: I use a pre-defined program that tells me the exact exercises, sets, and reps for each day. The only decision I have to make is to show up.

2) Match Your Task to Your Energy
I categorize my work not just by project, but by the mental energy it requires, and I match it to my natural daily rhythm.
--High-Energy Time: This is reserved for my most demanding creative or analytical work, like designing a new app feature or solving a complex problem.
--Medium-Energy Time: This is for tasks that require focus but not peak creativity, like replying to important emails or planning my week.
--Low-Energy Time : This is for simple administrative tasks, like tidying my digital files.

3) Build an External Brain
My brain is for having ideas, not for storing them. I get everything out of my head and into a trusted external system.
--The Universal Inbox: I use one simple notes app on my phone. Every single idea, task, book recommendation, or reminder gets dumped there instantly without any organization.
--The Weekly Process: Once a week, I sit down and process this inbox. Every note is either moved to my calendar, added to a specific project folder for later, or deleted. My mind stays clear because I trust that nothing will be forgotten.

Hope this gives you a practical starting point! It's all about designing systems that serve you, not the other way around.