When you get stuck in a creative process share your concerns as soon as possible. I advise you to do it with conviction. People react quite badly to extreme things. Propose a sudden extreme draft to your team so that their brains are activated!
I usually get stuck on the writing side. Finding a tone for a new character or for a specific moment. Finding the right words is always very complicated to me. I need time that often I don’t have.
Define a tone according with the context and circunstances. Write down lines as quickly as possible in that tone. Try to do it in an extreme way. Share it immediately with the team. If you have a week to prepare a dialogue (that never happens), imagine that you have one hour.
Pass your draft in slack or whatever with conviction: “I’m thinking something like this”. People will start to help you with ideas and concepts, believe me. They cannot accept that extreme thing. That is why you may want to be it: to activate their brain defenses!
With this technique you will get 3-5 potential tones and various references that I can explore! The team contributed to that and they will also feel more involved with the whole thing.
I hope this trick is useful to you!