You can start going out for extended periods of time to get him adjusted to being alone. You can give him busy bunny toys.. Slimcat balls with his food inside, toilet paper tubes with treats hidden inside, cardboard boxes, hay cubes (which should not replace his actual hay).. You could build him a larger cage. I assume he is in a rabbit cage? There's nothing to do in those. Building your own cage doesn't require much, just patience while building it! lol You can pick up cable ties and mats at the dollar store and the cubes are at walmart and target in the laundry section.
This is my most recent bunny condo (it's cat proofed :yes: )you can leave that part out! My bunny can get bored but with 3 levels I can hide treats and add different toys every day while I'm away.
This is my most recent bunny condo (it's cat proofed :yes: )you can leave that part out! My bunny can get bored but with 3 levels I can hide treats and add different toys every day while I'm away.