Try never to forget, when you feel really down ,how crap that feels, so that you try to never feel that way again. Especially about a decision you made that did not quite turn out right.
Don’t forget it, learn from it.
Try never to forget, when you feel really good about something, how wonderful it feels, so that you work to feel that way again. Enjoy and savour how good it feels to feel that way, remember that you did this,you accomplished this,and you can and will again.