I don't know how to end it, give me some ideas after completing the rwby arc.

No, she's not the hero who saves everyone or a villain that kills everyone.

The MC is extremely selfish.

She will do whatever she likes.

Also, don't expect her to be a hero. I loathe the hypocrisy called heroism. 

My MC won't struggle a lot, she's a Godly MC. 
Just turn off your brain and enjoy the ride.

If you feel like you have read about the system somewhere. It is the system from 'A multiverse adventure with Gacha system'. I recommend you guys to read it. The MC of that fic is Godly OP. I am following almost the same plot but with different path.