Are there people who changed their lifestyle habits before exercising when dieting?

In the past, whenever I tried to lose weight, I always started with exercise.

I signed up for a gym and changed my diet all at once.
After a few days, I would get exhausted and give up, and this cycle repeated itself.

This time, I’m going to try changing the method a little.

Rather than forcing yourself to increase your exercise time
I am thinking of starting by reducing the amount of time I spend sitting and increasing the amount of walking I do.

Use the stairs instead of the elevator or
Starting with the point where I intentionally walk short distances.

Even if you gradually increase your activity level in daily life like this
I am curious about your experience regarding whether it actually helps with weight management.

For people like me who can't maintain an exercise routine for a long time
I would like to refer to any methods that were effective for consistent practice.