Maybe you just need to take a break from doing the story, and then come back to it after a "holiday". Also, it sounds like you are busy with other things, too, so maybe you haven't been getting enough rest. I suggest you get some rest during your "holiday" from writing. That should help, too.
I wish I were good at writing stories. I have a number of different daydream universes, with several main ones, but I am not good enough at writing to convert them into written stories. Also, they are both too complex, and not fleshed out enough to convert to print. They are just part of my escape from the life I lead, but they do make things more tolerable. I get to control the social situations, and other stuff in them, and can try out problem solving in them.
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If a man does not keep pace with his companions, perhaps it is because he hears a different drummer.
Let him step to the music which he hears, however measured, or far away.--Henry David Thoreau