If you feel like the emotional moments you've written aren't hitting hard enough, that they aren't making you want to cry, that they aren't making you want to grab a character by the shoulder and shake them, that they aren't making you want to run out your room and scream to the heavens... it's because you've read those moments a hundred times before. You know what's going to happen. You know how it ends. It doesn't surprise you. It probably doesn't faze you. The scene isn't bad at all. You've just grown immune to it. But, your readers will feel like you stabbed them with a knife and twisted the blade. That's what matters.