What is the purpose/goal of heaven according to the Christian faith of all denominations?

I am a returning christian with many unanswered questions. I am now seeking the meaning of life through the bible after a positive experience in the Alpha course. Firstly, I am very curious on the purpose, objective and direction of heaven. We cannot be singing praises all eternity. Every Kingdom must have a goal or aim or something similar. What could it be, for eternity is a very long time. Thank you for reading.