For me at least, it worked to write every day, even when i was feeling frustrated and like i should be moving on and if i had a new idea i'd write it down and save it for when i needed a break from the novel i was focused in. Consistency is key, there is no magic trick and it will be hard but it's important to hold on to that story if you think it's good. Remember no one will be able to tell that story if you don't and the characters will never live if you give up on it.