(With two trillion dollars from the start, wouldn't life have no goals? Not at all: the stars are the limit!)
Why does humanity develop technology? For its own sake.
In the interstellar age, technological development ultimately returned to the self of life. Life sciences achieved brilliant breakthroughs: all tools became living things, and all living things became tools. Aside from the self that is life consciousness, everything became a tool of life. A planet was a field among the stars, a star system was a vast field, and the entire star domain was an ocean of fields among the stars.
A citizen of a cosmic civilization, reborn on Earth, swore to leave the planet and return to that ocean of fields among the stars.