Produce many words of fiction. Many. Many, many, many, many. Find out what makes words come out of you and arrange for that to happen a lot.

If you have a tendency to become defensive when criticized, dig it out of yourself with a melonballer and set it on fire. You can grow it back later when you are better, if you want (especially if it has self-esteem implications of some kind), but it is not your friend in the early stages.

Finish things sometimes. Finish a drabble or a 500-word vignette, if that's what you're up to. But do not start and start and start and never finish.

Fall in love with something about something you write. Love a character, or a setting, or a sentence, or a plot twist. You don't have to love everything about anything or anything about everything, but love something about something.