To activate peace of mind ,you have to keep the commandment of the Almighty God ,try and make anybody that comes in contact with you happy (mostimes it is hard but you have to do it ).Be contempted with what you have ,don't be too materialistic so that you won't leave a life of greed ,always put a smile on your face it keeps you healthy ,and also tell yourself that you are unique ,remove pride .

And I tell you ,you will leave a peaceful life (like a bird or water that has no enemy )

Stay blessed.