After Maggy, Rein started to tell Lauren what she needed to do in order to improve herself. Among Rein's wife who had elemental affinity, she was actually the weakest. She was definitely quite talented but not as talented as Rein and his other lovers. So she could not just become strong in a very short amount of time.
So the solution to her problem was to gradually train in order to become stronger. The Divine Destiny Token had recommended her several dungeons to try and several places to train. The only short cut she was given was a way to strengthen her bloodline to better utilise her mixed blood.
Using this method she would be able to utilise both the racial abilities of an elf and also the humans. So in this way, she would be able to utilise both her human and elvin sides. But the amount of strengthening she would get was not really too much so a gradual increase in power was the way to go for her.