Great advice, but don't treat it as a checklist. If you like to go to the gym, do it. If not don't do it, leave alone every day.
Your focus should not be in improving yourself and being the best you can be. It's about getting to know yourself better.
What is it that you enjoy. And if you don't know, now's the time to find out. Maybe it's going to the gym, maybe it's finding a great breakfast place. Sitting there, having breakfast, being around other people.
Finding activities that you enjoy doing outdoors, bonus points.
You've already done the first step in asking for advice. Even though it might sound neglectible, that's a great achievement. So many people suffer from depression and have a hard time to take this first step. Congratulations!
Get out there try things, learn who you are. Maybe there's this thing that you always wanted to do places you always wanted to see. Now is the best time to do it. And if there's no such thing, you've been given a great list of things to try.
Best luck to you in this new phase of life!