Sometimes I hate the word.
Knowing how something can be better and working toward that is a healthy part of any kind of work, but “It must be perfect!” is an ugly belief. Perfection may never come, and you may find that if it does, it will not satisfy more than “good” could have, if you were open to it.
The author and workshop leader Lola Jones has a practice she calls “Raves” which I love and practice. At the end of the day, find five good things to review. If one is depressed, it can seem difficult, but it can always be done. Remember the good things; discount the bad things. The old aphorism “The perfect is the enemy of the good” is something we must deal with as creative people.