We must do what is possible to establish Heaven on Earth.
According to the book A Course In Miracles (ACIM), we are already in Heaven. ACIM states this in the section Is Reincarnation Real in The Manual for Teachers.
Do what you can to help establish Heaven on Earth and in this Universe.
Always stay in Heaven if possible. Do not leave Heaven.
All that is not part of Heaven is ultimately illusions.
According to A Course In Miracles, we are already in Heaven! We have the power to create horrible illusions here, but Heaven is Truth though! Creations of light are real, according to ACIM.
Is Heaven not a beautiful idea? What do you want Heaven to be like? What do you hope Heaven to be like?
Maybe our desires for Heaven, help to shape Heaven?