1. Your body is the first physical entity you need to take care of.
2. Your mind is the first non-materialistic entity you need to take care of.
What we forget is that these two things often come hand in hand, in very basic ways.
For example, if you are trying to be physically fit, you will work out quite frequently and hat will help you make a daily routine that will ultimately help you mentally and you'll get tired and won't get much time for overthinking.
I can recommend some good channels on youtube which you can follow for a workout plan, like Sydney Cummings for intermediate and intense workout, Chloe Ting for beginners.
Also, if you are focussing on your mental wellness, which would be by enjoying little things, spending time with family and loved ones, having some me-time, watching humorous shows, exploring different types of comedy shows and movies, you will eventually feel better in your mind and heart. Try out these types of humor for the beginning
https://humornama.com/featured/education/types-of-humor/. Find out which one suits you the best.
ou should try watching shows like Friends. HIMYM, other sitcoms and romcoms to enjoy your time better.
Trust me, laughter means a lot for our health!