Adhering to a regular sleep schedule (>7.5h, same time, good sleep hygiene)
Regular weightlifting
Consciously investing in interpersonal relationships
Confine work meetings to 1-2 days per week rather than letting them spread out over the week. (File all-day busy events on other days so they don't get anything scheduled.)
Regular cardio exercise
Quitting all social media/"junk food" web content
Try to chat with people in your day to day life who are willing to
Negotiate for non-monetary QoL improvements at work rather than salary, notably additional vacation time or 4-day weeks
Mediation/mindfulness practice
Self-compassion practice
Gratitude journaling
Daily meditation practice
Seeing a therapist regularly
Minimize commute time or switch to near-100% remote work
Writing down your plans for the day every morning
Adopting a cat/dog
Abstaining from drugs and alcohol (caffeine not included)
Doing charity work
Reduce or eliminate contact with people who are unethical, rude, disrespectful, or who don't honor their commitments
Building and using a lumenator
Yoga practice
Weekly reviews
Intentionally spending 2+ hours outdoors most days
Taking a psychiatric medication
Quitting video games
Enrolling in an educational program (e.g. coding school or graduate degree)
Moving to a new city
Adhering to an "early bird" circadian rhythm (e.g. 9pm-5am sleep)
Adopting a small animal (rabbit, rat, fish, snake, etc.)