Screenplay idea needs fleshing out

Hi,

I have written a fair few stories and screenplays, but I have a bad habit of getting preachy. It's hard to avoid because all my ideas lend themselves to philosophical themes, and I wrote a unique philosophy book. Anyway, my full page synopsis for a romatic film Soulmates was filled with preachiness, so I've cut it down to one paragraph and now need to flesh it out to a full synopsis. Suggestions for an entertaining (not preachy) approach would be appreciated. EDIT: Despite how the post's title sounds, I am not looking for content. Rather I need a way to break the habit of being preachy in this scenario that unfortunately lends itself to being preachy:

*Tarsh and Beth are two Native American lovers whose tribe is wiped out due to Tarsh’s hotheadedness. Three hundred years later, Tarsh and Beth have had their memories erased and are now two highly-evolved spirits—soulmates exploring wonderful astral realms throughout the spiritual and physical cosmos. Nevertheless, they are finding that non-physical life lacks juice, so when they happen upon the Milky Way Galaxy in 2002, they decide to incarnate on Earth. He wants to save the world, but she just wants to have fun. They meet in their early 20s when he sings as a busker in threadbare clothes. Her father Noel, a wealthy rightwing politician, disapproves of their relationship. But when he has a heart attack, Tarsh saves his life and Noel offers Tarsh an influential job. Then, in a car crash, Tarsh and Beth have out of body experiences. They survive and go to a tarot reader hoping to get an explanation for the strange things happening in their lives. She informs them of their Native American past lives. This triggers memories of their pre-birth desires, but now it is Beth who wants to save the world while Tarsh, tired of the drama, just wants to have a damn good time.*

***Logline***\*\*\*: To save the world or have a damn good time? That is the question.\*\*\*