There's this cliche I've often heard. When life gives you lemons, make lemonade. Now that does take a bit of work. First you need a knife to cut the lemons and either your hand or a gadget to squeeze the lemon. Water and sugar need to be added. Or you can open a can of frozen lemonade, or buy some in a bottle at the supermarket. One is easy and the other is hard.
Which do you choose? Let's put this in the mode of writing. You can reach a point in your writing when you think the story has become a lemon, sour and unappealing so you need to sit down and decide what to do. Of course you're going to make lemonade out of this story.
Maybe the plot needs tightened. Then give it a squeeze. Or the characters arne's the best you can add water to dilute those traits you don't like or add some sugar to make the character a more rounded one. Sometimes you need to slash scenes where you've gone off track. So you get out your knife and slash those scenes. You finally sit down and attempt to squeeze every bit of drama or comedy from your story and
Like magic, you have made lemonade from that sour unappealing story.