Dreaming about doorbell is a subconscious creation to get attention from your conscious mind. Maybe there is something that you have overlooked. You need to open your eyes widely, if you want to see an opportunity. Try it and you will realize that a lucky chance is open to you. Alternatively, in the dream to hear or to ring a door bell is an indication of your curious nature, it indicates that you are seeking for new experiences. To dream that someone else is ringing doorbell, can be induced by external stimuli. Often we dream things that are actually going right now. Maybe someone has ringed your doorbell while you were asleep.
Read more about dreaming of Doorbell in other dream meanings interpretations.