Habit, improve a bit, one at a time
when you want to make a behavioral change you have to do it repeatedly for a lot of days till it becomes a habit. Once it becomes a habit, it remains with you.
Starting and getting to the point it becomes a habit is most vulnerable part of it. As Jerry Seinfeld puts it Skipping one day makes it easier to skip the next. So one must use a Bold visual remainder to see if one is on the track every day doing the tough task of undergoing the change.

The most important thing is to focus on one. We all have limited resources to invest, its important to invest more than the critical amount and not dilute the efforts we want to put in for change. So pick one change you want to implement and focus on it every single day. Once we have done one change it will have a slow ball effect on the future change we want to make and change will become easier for us.
These can be very simple things like going out for a walk, exercise, eating the right meal, packing lunch for work the next day etc.
Another important thing is to do it regardless of the outcome. Change does not happen overnight and its no use measuring the outcome before change happens. It will just make us worry more if its working and keep it away from making the change happen.
With focus, practice and visual feedback on how are we on track we can change for good.
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