Doing your best looks different every day. Isn't this so true! Everyday is different and so are you. The only constant is God's love which appears everyday and every night.
Doing your best is not determined by how many things you get checked off, how active you are, or how high your energy levels are. Doing your best is defined by being mindful of who you are in the moment and catering your day around that.
Say no to something when you are tired or need a break. Say yes to the people that lift you up and inspire you. Say no to that negative thought pattern cause it will only hurt you and keep you from accepting your current self.
Say yes to accepting who you currently are. That is doing your best.