You don’t get better on the days when you feel motivated and creative.
You get better on the days when you don’t want to do anything, the days you feel unproductive and hitting a wall… but you go and do it anyway.
If you can overcome the negative energy coming from other people who just try to bring you down, your tired body or unmotivated mind, you will grow and become better at your craft.
It won’t be the best output you have by any means, and you won’t accomplish as much as what you usually do when you actually feel good, but that doesn’t matter.
Growth is long term, and so the crappy days are more important.