You do not become a disciplined trader in one day.

You become a disciplined trader through a series of small & boring, actions, repeated everyday, until they become instinct - who you are.
These actions are not heroic, they do not garner attention, praise, or really much at all: they are identify forming. 
Just as you drink water when you are thirsty, or brush your teeth before bed, these low intensity actions are almost instinctive.
So keep your trading a clean space. The right thing to do is often the boring one. That's how you reprogram your overstimulated limbic system.
Kaizen: incremental improvement by making small, sustainable changes over time.
The solution is not a grand set of rules, a half-assed promise to yourself to "do the right thing starting tomorrow" or "never over-leverage again"... it is instead to make small, calculated redirections, to shape your long-term behaviours and nervous system responses.
Here is a simple framework based on the Japanese philosophy of kaizen to approach rewiring your responses to losses.
1. When you lose a trade, immediately stand up, walk to the sink, and drink a glass of water.
2. At the end of the trading day, red or green, journal, and reflect on just two question:
i. Did I get up, and drink a glass of water when I lost today?
ii. Did I blow my account today?
What you are doing is creating space between stimuli and action. Your instinct is to revenge trade, make it back, over leverage etc.
Instead simply drink some water, chill the fuck out, and realize that as long as you have equity to trade with, meaning the answer to question (ii) at the end of each day is "No"... you will be absolutely fine.
In time losses will mean significantly less to you, and your nervous system will not see a loss as such an imminent threat, which justifies a huge action (an action[s] you almost always regret afterwards)
Identify areas of your trading, and moreso your life, and apply kaizen. Small incremental changes, to reshape your identify.
You will never be a perfect trader, nor a perfect man. You will still have bad days. You will still make mistakes. That is the human condition.
What will change is the long term destructive spirals. The type of spirals that walk you back to square 1 each time; the spirals you promised yourself 100 times you wouldn't see yourself in again.
You do not need to become a good trader immediately; you simply need to become a person who destroys themselves a little less each day... that's it.
No need for perfection; no need for destruction. No "changing your life in 30 days" or resetting your funded account stack every 2 weeks.
Slow, boring, repetitive, identity shaping.
Wake up, brush your teeth, take your trade, win? great. Lose? drink your water, journal your 2 questions.
Afterwards.... go on about your day and live your life. Repeat.
Slow, boring, repetitive, identity shaping.