I'll be frank, your story doesn't have much appeal. Or, should I say it's too decent for this degenerate den? I'll suggest you some simple fix so you get the picture.
First of all, make the female lead a waifu material. Sell this in the cover and the synopsis (just a little hint is fine). This one is very important.
Second of all, add some mystery to it. Say, this girl who asks the MC out has an ulterior motive. Maybe something related to the MC's past and the reason why he hates women? This will make the readers more curious. Has a lot of potential for more drama as well (be careful with this, though, some drama can be really annoying).
Third of all, add some other girls. I don't mean you should make it a harem, but adding love rivals (strictly female rivals if you write for guys) will spice things up like nothing else.
Lastly, if possible, add some supernatural elements to it. Doesn't have to be completely fantastical, just something out of the ordinary. Think the Bunny Girl Senpai anime and light novel. That story has supernatural elements to it but still grounded in reality. Or another very famous title, the Melancholy of Haruhi Suzumiya, also has lots of supernatural elements to it. This one is not necessary but it will boost the appeal a bunch if you add it in.
Well, these changes are still pretty much within the genre or niche you chose to write in, but if you really wanna go all in on the appeal boost, you can join in the bandwagon of fantasy, LitRPG, or Isekai. Love them or hate them, you have to admit these genres are extremely popular on this site. As someone who loves these genres myself, I understand the appeal completely, but if they're not something you love or passionate about, you can ignore them and stick to your things.
Just my opinion, though. Do with it what you will.