"Fill your bowl to the brim and it will spill. Keep sharpening your knife and it will blunt. Chase after money and security and your heart will never unclench. Care about people's approval and you will be their prisoner. Do your work then step back. The only path to serenity."
Doing things with high intensity is not the way. Always be mindful of how much you take. Take only what is needed. Practice 'karma yoga' which revolves around lessening your attachment to the outcomes/success of your work. Give yourself space from your work.