Rate more girls. A lot more.
This is also the answer to your next 10 questions. Rate more girls. Then rate more girls after that.
Like, rating 50+ is just barely getting started with the game. Using autorating can help you out, you can autorate and just click through several dozen to get a better start, but doing some quick tweaking may be worth it as well.
Yes, it is tedious. No, the dev doesn't seem to care to do anything about it.
There is a wealth of information in the thread, it is probably worth your time skimming the thread from the start, read the longer replies.