What is it on right now and how far ahead of schedule are you? The turkey can take a long rest, up to an hour, and be totally fine. But normally you'll want to roast at 325, yours is likely a 4-5 hour turkey. If it's going way to fast try 300 degrees, and then maybe a heeat blast at the end to crisp the skin.
What temp are you cooking the bird at? You should definitely turn down the heat to slow down cooking. Our temp + time + weight guide is here: https://food52.com/blog/11646-the-essential-numbers-a-guide-to-times-and-temps-for-cooking-your-bird
You could also finish the turkey ahead of time and then refer to Ina's advice: https://food52.com/blog/11742-ina-garten-s-make-ahead-thanksgiving-advice
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What temp are you cooking the bird at? You should definitely turn down the heat to slow down cooking. Our temp + time + weight guide is here: https://food52.com/blog/11646-the-essential-numbers-a-guide-to-times-and-temps-for-cooking-your-bird
You could also finish the turkey ahead of time and then refer to Ina's advice: https://food52.com/blog/11742-ina-garten-s-make-ahead-thanksgiving-advice