Trying to change twelve things on the same Monday is a great way to change none of them.

Starting twelve changes at once splits the same limited store of attention twelve ways, and the first difficult day takes all of them down together. It feels like ambition and behaves like a guarantee of failure. One change at a time is slower on paper and much faster in practice.

Choose the single change that would make the others easier if it stuck, and run only that one for a month. Write the rest on a list for later. The list is not abandonment, it is a queue.