As posted, provide lots of chew toys, you can make your own. Some of Mya's favorites are chunks of wood, a crushed Milk jug and the plastic 'whackers' from an old 'Whack a Mole' game.
You have to be on a young pup about all the time when out loose in the house, chewing and potty are the main reasons. They need exercise, stimulation, and socialization, but when you have to get something done you should crate the dog.
Our pup is just about 16 weeks and her chewing has gone down a fair amount. She has a fair handle on what's O. K to chew & what's not. Her nipping has dropped off too.
So my advice is to continue to power through and keep the pup under close supervision when loose.