To live in peace and tranquility in society you need to live alone because whenever you mix with people you will face some kind of problem. Mindfulness and meditation can have a positive effect on mental health, but you have to cultivate yourself for it. The more money you have personally, the more peace you will have. You must have the ability to gather the necessary content according to the needs of your life. Be altruistic so that other people will come to help you when they see your problem.
Except you're naturally an introvert, else complete exemption and disassociation from people may not really be the best option for everyone, because no matter how much money you have or what financial status you may have acquired, you'll still need people.
So rather than completely disassociating yourself from everyone, you can choose a few people you can associate with, people with like minds as yours, that way you won't really have to encounter much problems, because as long as you're human, whether you associate with people or not, you'll still encounter some problems in life, and sometimes these problems even with your money, you still need others to help you solve 'em because you can't always solve 'em on your own.