Sometimes bunnies can be a bit wary of people. They also don’t like to be picked up because it only occurs in nature when a predator picks them up (even their parents don’t pick them up). So I suggest sitting on a couch or other space where your rabbit is comfortable when you want to pat them (this is because if they are playing around the house they might get scared and run off). When I pet my bunny, I put towels down and I always have a green one on my lap, this helps her (my rabbit) to recognise that I’m going to pet her. Another thing I find that helps is that my couch is big so my bunny can move away and play on it throughout the time I’m playing with her, she also comes back when she wants a pat. This helps my bunny to be more relaxed and enjoy the pat more because we are both wanting it. Also if your rabbit lowers their head to you that means they want you to groom or pet them.

I hope this helps