Q.How dead brown is too dead brown?
My fern is 99.9% dead/brown with maybe a half dozen green tendrils. If I drastically cut all the dead down to a couple of inches, do you think it can come back or is it worth trying?
I always struggle with these decisions too!
If you seen green and signs of life, why not give it a chance!
Trim away the dead leaves and stems.
I have had ferns make very good recoveries myself!
Here is a link about indoor fern care.