I am not an expert on happiness. I do not even have my crap together. But my biggest advice is to realize that our brain is wired to look for problems- problems in others and ourselves. It’s a survival instinct. That is why we are so quick to judge others and especially ourselves.
What should we do about it? Listen to our thoughts and realize they are just thoughts. It doesn’t mean they are the truth. Our minds are a train station. Thoughts come in, but we decide if they get off the train. We can always decide to let them go past. We can decide to send a thought packing.