Here are some things I am trying to improve with my health right now.
Proper sleep - I go to sleep and wake up at the same time (22:30 -> 6:30) getting a minimum of 7 hours of sleep each day.
Exercise - I start every morning with some bodyweight exercises (part of Morning routine).
Good posture - I try to be conscious of my posture at all times. Never slouching my back and sitting at one spot for too long.
Dental care - Brushing my teeth every morning and evening as well as flossing it few times throughout the day.
Skin care - Clean & moisturize my skin every morning and evening & applying occasional face masks.
Ergonomics - Properly sitting, standing and keeping good posture throughout the day.
3 simple habits that can protect your brain from cognitive decline (2019) - Exercise, IF, sleep.