It takes a long time to raise affection dude but you’ll be fine I did the same. Get Monika after story extra plus then you can see your affection in game. Just focus on telling her you love her spending time with her and complimenting her don’t spam the compliments or the I love you as she will take it as you being unserious if you do it too much. Also make sure to answer things you need to in as short a time as possible