Q.palm tree winterizing in fort worth tx
It’s December and I came back to my plants having brown leaves and looking to be dead. What do I do to winterize them and save them?

Winterizing refers to how to protect plants from winter cold before it happens. If your palms have already been hit by cold so that the leaves are brown, winterizing won't change that. The only thing you can do is try to protect the growing tip inside the leaf cluster; if it is not killed, the palm will put out new leaves in the spring. Although this article is about sagos, which of course are not palms, the principle is the same. Check it out for some suggestions: https://www.gardeningknowhow.com/ornamental/trees/sago-palm/sago-winter-care.htm
You might also want to look into planting palms that are winter hardy in your area, or putting the less hardy ones in pots that can be brought indoors for the winter. The county extension service could be of help. This link will help you find the nearest office:
https://www.gardeningknowhow.com/garden-how-to/info/what-is-extension-service.htm