If you can get cardboard boxes you can make new cardboard houses to him often, although save one special house so he always has a secure spot he can rely on is always there. Rotate toys so he doesn’t have access to them always. You can make a treatball out of cardboard, many buns like to chase a treat ball and it can be a very good way to serve their pellet dinner – it’s good for exercise plus it slows eating.

Twigs and small branches from trees that havent been treated with pesticides are also a nice activity for bunnies – they often get very good at stripping bark off of twigs with a little practice. The bark is good fiber but non-fattening. Apple, willow, rowan, hazel, linden are examples of bunny safe twigs. You can hide food so he has to search for it – I put dry dandelion leaves in several places around the apt and the bunny has to find them himself. If he doesn’t find them, they’re just dry leaves and wont get nasty like fresh veg could get. Searching for food is (rather obviously) the more natural way of foraging for a bunny.

As you’re on a bit of a tight budget my advice would be…save all cardboard! (At least cardboard that isn’t glossy like cereal boxes) If you get anything delivered, save the box. You could even ask a local shop to save you some boxes and I’m sure they’d be happy to oblige as then they haven’t got to discard it. There are SO many things you can make with cardboard such aa hidey houses, castles, a fort, obstacle course etc.

Cardboard tubes (from toilet paper and kitchen roll) are great simply stuffed with hay and some leaves/flowers. Even just with hay in, my rabbits are pleased but add some dandelion, my goodness they’re over the moon.

You could also make a fleece forest! Olaf’s Mum cut strips of fleece and stuck them to the back of a chair I believe so that they’d hang and Olaf can run through. I made one for my rabbits on their hidey house. You could add strips of fleece to a cardboard box. Just be cautious if he starts to eat them. A nibble here and there is fine but you don’t want him ingesting too much.

Hiding leaves and flowers to encourage foraging is a great option too. If you have access to a garden with no pesticides you could grow your own (check what is safe for bunnies of course) and then you can dry it out yourself so it doesn’t go wilted and weird and will keep for a while.

You could hide treats and stuff inside cardboard tubes too. If you search diy rabbit toys on youtube, StormyRabbits has a couple of tutorials