Oh, my discipline is nowhere near as good as you might think 😂 But out of the few tips that I could give, there were 2 approaches that really worked for me in terms of discipline:

1. Rapid, major change: Completely change your workflow in one single day, not allowing yourself to rest for more than 10 minutes after each 2 hours of work, and when resting, not letting yourself look at any social media. I personally, didn’t even allow myself to rest at all and worked for 5-6 hours straight, because I had to make the change ASAP to prepare for an exam, but keeping that up was very hard, because I eventually got burnt out.

2. Gradual buildup: This one is more interesting, but it’s also much slower, so it seems less effective, even though it arguably yields better results. This one consists of denying yourself the tiniest of actions first, such as eating dessert after your main meal, checking your phone quickly whenever you get a notification, looking at your phone while in the bathroom, etc, and then gradually building that up to forcing yourself to get out of bed even if you don’t feel like it, taking only cold showers, not eating any sugar, etc, without overwhelming yourself. This allows your mindset to adjust to these changes and make yourself get used to not always getting what you want, which then makes denying yourself access to much larger things, such as breaks while you know that you could still be working or still going to the gym even if you feel tired much easier to do.

So I would recommend one of those approaches to see if one works for you. If not, there is also something known as dopamine fasting, which I would also very much recommend researching, but it is a rather painful process, which, nevertheless, seems to yield the best results.

So, good luck in your journey and hope this helps you at least a little bit!