Sometimes i do crazy hours at work, e.g. 6:00am until 9:00pm how can i fit in my habits if im exhausted.

Just like how much time you put into your work, your habits are to be prioritized in that manner. Your job gives you a pay that’s why you invest that much time, your habits too gives a pay in the long run and even short term as some of these habits keeps you fit and healthy just like drinking water, eating good breakfast, exercise etc. Your habits are just as important so please make out teenyy little time for it