Your schedule cannot understand that every invitation feels important.

Your feelings about an invitation and the space in your week are unrelated quantities. Everything can feel important and the hours remain the same number, and the calendar will enforce that regardless of how much you wanted to do it all. Emotional weight does not create capacity.

Make decisions against the calendar rather than against the feeling. Look at the actual week before answering. It is a colder method and it prevents the collapse that comes from agreeing emotionally.