I agree with the previous post, you need to be eating 500+ calories over your maintenance (watch the scale move up) and eat at least 1 gram of protein per pound.

And common wisdom is that ketosis is not optimal for adding muscle. It can be done, but most experts suggest more of an isocaloric diet so that muscle glycogen is filled up and anabolic hormones are turned up.

Also realize that with muscle gain there is a tagalong fat gain. Your extra calories have to go somewhere, just hope it is mostly muscle. Train Hard and Sleep Well.