Kaizen, traditionally a Japanese business term, is an approach that focuses on small incremental changes to improve efficiency. This is a great way to think about habit changes.
What is one small change you can make this week to shift a habit?
Adding a new habit? Do it for 3 minutes.
Quitting an unhelpful habit? Start by noticing what triggers it. Then change the response to the trigger. E.g. Do you find yourself eating a tub of ice cream or drinking a bottle of wine when you have a shitty day? Go for a run, or journal instead.