I would eternally use said power to say the following:
nah lol. I'd.. uh...
*remove all the men from both risa and orion, hence be with all the ladies. First you get the power, then you get the women.
*Puff into existance a billion bars of gold pressed latinum and use it for nepharious means.
*Go back in time and polish jean-luc's head
*Go back in time and remove kirks rug
*same as above, but kirks hair into a tribble.
*make an alliance with the borg and help them develop new technologies and a mega cube so large, it uses spheres as torpedos. Then watch as it conquers the galaxy. Then reverse time and make sure it never happened.
*Go back in time and make Star trek voyager more INTERESTING.
*same as above, but make it ONLY about the borg and voyager.
*same as above, but make the series Star trek: borg
*enlarge my body so I can fly in space like in the STO mission.
*Make a snazzier uniform so i don't look like a religious leader.