Carry and use a notebook.
Keep tidy. Have some kind of index. All you write will be of use sometime if only you could find it.
Don’t give up.
Edit. Everything and anything can be improved.
Allow yourself to write. Admit to being a writer. To be able to write you have to be honest even if it’s only to convince yourself.
If you use a computer then back it up and keep the backup safely away from the computer.
Don’t believe writers tips.
First bad pieces are great learning tools. Don’t throw anything away.