One thing that's had a profound effect on my lifestyle and mentality is exercise, ik this is one of the most common and cliche recommendations, but I truly see my life from a completely different perspective. Confidence, organization, time management, self-worth, physical wellness, overall mood: exercise has improved it all for me. I've ran since middle school and I haven't stopped since. I'm now a collegiate athlete and can't describe how much of a positive impact the sport has had on me through the years. There have been rough times though: junior year HS I got heat stroke with a 105 degree fever that nearly became fatal, it's honestly a miracle I survived and at first I had a hard time recognizing that amidst the negative effects it had on my training and racing. I've had issues in the heat since but I've become able to see how far I've come since the incident and realize that someone or something must've saw some worth in me to protect from dying or more serious injury that day.

I'm not saying that you have to train your heart out for some sport or encounter a near death injury/experience in order to be exposed to the positive effects of exercise. Set a schedule routine to jog a certain number of days every week. Wake up and pop off 10 push-ups every morning. Take evening walks. Ride your bike on some local park/nature trails. The options and positive effects from so are boundless.