Just for today, notice any time that you are tempted to criticize your partner, and then don't!
Be aware of any sense of irritation, annoyance, anger in yourself. Communicate with "I" statements rather than pointing out what your partner did wrong. Picture yourself conveying with compassion what you need. Stay centered and calm.
See if you can withhold all critcism. No shaming, no blaming, from this day forward.