Increase your adrenaline and noradrenaline either naturally (aerobic exercises and cold shower/shock) or with chemichals (stimulant and sympathomimetic drugs). That will increase your focus and goal-oriented behavior. It’s really crazy when you’re able to achieve a 100%+ flow state. If you have heart problems you shouldn’t do it tho. I had tachycardia for 1 month straight.
The same happened to me lol