Why Novak Djokovic is still playing ?

I I was mentioning before that I play professional tennis for several different reasons you know uh some personal reason is that I feel that on the tennis court I always have an opportunity to learn something new about myself and fight with my own demons you know and uh that that I guess we all have and when on the tennis court um in the midst of the battle um some of the things surface and and you know I have to deal with it so it's a great School of Life for me uh and then at the same time of course I have professional goals and and Ambitions and those are grand slams and being number one in the world those probably um Pinnacles of the professional tennis world have always been there as goals for me so I do want to make more history of this sport I feel game wise physically I still can sustain and maintain the the top level so as long as that's the case why not you know keep going