well basically she got rewarded for finishing a route. she doesnt have to make the male characters fall for her but rather get the ending. for example in this chapter she got the ending for making the perfume. and the more endings she gets the more og fl's influence lessens. after that she went to her childhood friend to get a certain territory from him that will allow her another ending, but she finds out he already gave it to the og fl. but the og fl just got the land and no the doctor friend thats needed for the ending. but she leaves that ending for later. now she focuses on the magicians ending, so she sets a trap for him. (his ending is that he leaves everything for the female lead so she found a different way to go about it) and thats basically it (=・ω・=)
https://shibamanga.com/manga/i-stole-the-heroine-s-first-love/chapter-30/
Here's the translation if you ever want to actually read it
Someone needs to translate Chapter 30 I can't Read Korean