Don’t complain about every small thing that irritates you. Be more accepting and let things be. Your partner is a different human being, so let them be that. Accepting the differences makes the similarities more enjoyable
When we fight, one of us tries to stay calm and not make it a win-loss ego situation. It doesn't mean don't share your point of view, instead, wait for the nerves to have calmed down.
Having shared goals and working towards them together has been very helpful in keeping our relationship strong e.g saving for a vacation. Having something to work towards together keeps us motivated and gives us a sense of accomplishment.
Understanding where my hurt or fear or neediness came from was the first step in helping me strengthen our relationship. Getting to know myself better really helped me feel happier in our relationship, including the hopefully passionate, exciting, challenging, and rewarding life-long relationship with myself and my partner.
I unknowingly started expecting my partner to be a reflection of myself, often asking "why can't you also" when pointing out things I do. But I realized that he brings his own strengths to the relationship, and expecting him to mirror me is not fair or healthy.
Building open, clear and safe channels of communication in your relationship not only removes the stress and distance of guesswork, they also bring in fulfilment, empathy and a real chance of growth. Remember, no matter how well you know your partner, you can't read their mind.