Hi benjis_mommy…my friend was actually just having this same problem. She tried everything from using a water mist spray, the vinegar method, etc. If you’re providing enough good chew toys AND giving him lots of attention and he’s still being stubborn, the first thing I’d do is stop letting him roam free around the house. Confine him to a room or an area until the bad habit improves. A lot of rabbits won’t grow out of chewing habits (some might though!) because they simply like to chew and dig, it’s in their nature. Keep a close eye on him in the confined area and make sure you firmly tell him “NO!” when he tries to chew. Then immediately provide him with a toy he can chew on. Also give him lots of attention when you’re with him and he’s roaming around – I find that when my bunny is running around and I’m occupied doing something else, sometimes he’ll resort to destructive behavior to get my attention). This worked for my friend after she did it persistently for about two weeks and although he hasn’t completely stopped, he rarely ever chews the carpet anymore cause he prefers his chew sticks and he knows now that chewing carpet will get him into trouble
I hope this works for you too! Unfortunately I can’t provide any personal experience because I have hardwood floors, so I can only go from what my friend has told me. Good luck!