Best way to improve once self?

So im taking 2 weeks to focus on myself in those weeks i won't do any extra socializing then necessarry meaning I won't hang out with Friends the reason being is that I got betrayed by a good friend and I found out my bestfriend isn't trustworthy he has been lying to me for over a year so Im gonna focus on myself and In those 2 weeks id like to improve myself significantly I will start going to the gym as much as possible I will only eat healthy and all my free time will go to my business but what are some other ways to improve?
Best way to improve once self?
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