Know the difference between keeping the peace and sacrificing yours.

Keeping the peace usually means someone absorbs the discomfort so the surface stays smooth, and it is generally the same person every time. Having peace means the situation is genuinely settled. They can look identical from outside while feeling entirely different to the one doing the absorbing.

Notice whether the calm in a given situation costs you something each time. If it does, it is being purchased rather than possessed. Consider letting one small disagreement stay visible instead.