Different surfaces
Introduce your puppy to a variety of surfaces at home like gravel, tiles, lino, grass, tin foil, newspaper etc.
And duvets….obviously!
Instead of putting food into a bowl, try scattering biscuits in the garden or on the floor. Use puzzle toys if you have them, or make some if not – empty toilet roll tubes and cardboard packaging can be great to hide kibble inside.

Despite travel being limited, you can still get your puppy used to being in the car. Once he/she is happy sitting/sleeping in the car, try turning the engine on, playing the radio etc. Reward your pup for being calm and settled. When your puppy is comfortable being in a stationary vehicle, consider taking him/her with you on short essential trips to the supermarket.