Here’s some advice I frequently forget to take myself:
On those days where it seems like you’re that person on the sidewalk playing your guitar to an audience of none and you ask yourself, “Why am I doing this? Who is even appreciating this?”; on those days, don’t forget the person stuck working a shift inside the building you’re sitting next to who appreciates the music but may never get a chance to say a thing.
Play/write/create for you.
You never know who’s inspired by you… just being you.