By doing something grand and widely important

"Uh... well, there are many ways which a deity can assert their powers. Mainly this is through miracles and prophets and such, but, ehm..."

The consultant is highly distracted by Eva's buxom appearance and sly smile.

"...We here at Goldberg believe that this is an unrealiable and moreover outdated course of action."

"Really?" the cartoony Goddess shifted her imposing figure, setting a certain tension of uncertainty in the atmosphere.

"Y-yes. I suggest that you embark on something grand and flashy! Like... make Heaven a reality, or arrange the stars in your stunning visage."

"Hmmm. Nothing that pedestrian, I'm afraid. Oh, but I did get an idea just now! Wait 'till you see..."