Anything soft will soak up sound. Carpet, foam, old duvet etc.

Ensure you have enough room to swing the rifle from above and from the side. Depending on your level think about how much room you'll need to put the rifle on a stand between shots and a mirror. A target whizzer would save you loads of time. Lighting that works with scatt etc.

Make the range usable and you'll use it more. 10m at home is a really nice thing to have.