When did you last feel genuinely settled? What made that possible — was it circumstances, practices, orientation, or something else?
Which fluctuations in your life have most disturbed your inner balance recently? Were they circumstances, relationships, internal states, or the anticipation of things that haven't happened yet?
Is the steadiness you are looking for something you want to feel, or something you want to be? The Qur'an seems to be describing the second — a quality of the person, not a state of the moment.
What practice — remembrance, prayer, gratitude — feels most accessible to you right now, even imperfectly and inconsistently? What would it mean to return to it?
What would it mean to practise gratitude not as a sentiment — not forcing yourself to feel glad — but as a deliberate act of noticing what you have been given?