My mega goal theory...

A mega goal can...
Make you or break you.
Build you up or drive you into despair and keep you bound cynical, as a soulless vagabond, even if you remain money rich.

Why do I put forth such a contrast?

Leverage!! It is all leverage from your heart, thus your soul.

And the greater you extrapolate and commit, well the more intensification one way and another.

Better to start with...

Who am I?
What is my soul's desire in being here?
Where am I going when I depart and what will suit me to remember about myself most?

You might answer these questions as well for further clarification:

When I die/leave tomorrow, what do I today?
Roll back a yesterday and what do I do instead?
When I die/leave ten years hence, what do I daily now?

Committing to a goal can cost you as well as serve you and most likely still be a mixture of both, for knowing one's own soul is generally still a misty affair.