To get by without, you have two options: incredible discipline and force of will, and overcompensating with other stimulants.
Meditate, exercise, do anything it takes to force yourself into whatever structure fits your life. I'm talking to-do lists for your to-do lists and scheduling your daily time down to brushing your teeth. You have to force structure onto your life to contain your attention and energy. You have to make some truly profound changes in your life.
Or drink way too much caffeine, smoke too many cigarettes and try very hard to not think about the damage you're doing.
The only shortcut I know of is to get enough black market adderall for a couple of months and use that to keep yourself functional long enough to build the systems and habits that can keep you going without.
See the Getting Things Done method, pomodoro, and find a good task management system. Write everything down, find a system for keeping notes. Also try keeping a diary.
Also try to reduce your phone and computer usage. If your phone supports it, use monochrome mode. Push yourself to read more books instead of watching videos or playing games.