Need help to start this journey

I know the theory behind building discipline, but bridging the gap between knowing what to do and actually staying consistent has been my biggest struggle. I’m at a point where I want to completely shift my daily mindset and environment to achieve a true self-control.
To “”break free”” from constant digital noise, I recently sold my Apple Watch and replaced it with a classic Casio watch and it feels surprisingly refreshing. I also deleted most social media from my phone, restricting my usage to just Instagram, X, and Reddit.
Do you guys have any tips or systems for building discipline, organizing goals, and actually sticking to them when motivation fades? Thank you in advance!