how does this manga keep getting uninteresting the more it progresses

Because of the harem probably you kinda already expect the situation to go a certain way because of the harem tag..... so pretty much its predictable

tbh im fine with harem when the characters and story aint a trope and cliche milkshake which is kinda rare lol, the characters are so hard to get invested with

Oh, so other kind of harem exists?? I tought harem = dumb titties & panty shot parade