The most radical approach you can take to improve your creativity and intelligence is telling as few lies as possible. You relieve yourself of the mental burden required to remember lies you've told. You clean your machinery, everything flows easily.
Finally, you can concentrate.
eat real food. move your body. sleep without your phone in the room. get sunlight before you get screen light. these are not wellness trends. they are just the basic conditions your body was designed to operate in and has been running without for years.