For efficiency sakes, I’m pasting what I replied with on a similar post, but I’ve made some modifications based on your specific situation.
Before that though, I will mention that there is a post-neuter craze which occurs following a neuter and in some cases can last 1 to 3 months. During that time, hormonal behaviors like peeing on things (you) to claim it can by amplified. So this could be a temporary surge that will lessen in the next few weeks.
You’re off to a good start. Cleaning up accidents and moving them to the boxes is good for sanitary reasons and to help make the connection, but more will need to be done since she’s not picking up on it. Think about it this way: You need to clean a litter box regularly, so there are times when your rabbit needs to know that the litter box is where she needs to go, even though it doesn’t currently smell like her. The learning isn’t “Oh, my pee and poop never stay here so I guess I shouldn’t go there anymore.” It should be “Oh, if I need to go, I need to always go here.”
To make that “here” connection, you mau need to physically move hwr to the litterbox every time she pees or poops, since the poop being there isn’t enough for her.
I trained Wick (and still do) by doing a short hiss every time he pees outside his box. I then immediately take him to the litter box. It’s a better teaching moment if I hiss and stop him before pee exits, that way I put him in the box and he pees in it, so I can praise him for that perfect litter box behavior. After doing this constantly, he got it, to the point where if I put him in a litter box randomly, he’ll pee if he has a pee built up in there (very helpful when I suspect he is in search of a place to pee but isn’t thinking about the litter boxes).
I watched his butt madly, pretty much all the time. I do the same for poops as well. In fact for poops, I’ll put him in the box, and he’d jump out sometimes and drop a poop and I’ll then immediately put him back in the box for pooping directly outside the box.
Do you think this is something you could try? The hiss works well for Wick because the sound spooks him and gets him alert (helpful for training purposes), but mainly you just need a consistent sound so it becomes associated with “you’re about to go in the litterbox because of what happened right when I made that sound”. If you know he tends to pee on you, be ready to make a sound once you see that butt arch to pee.
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.