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The subject of intentional breeding or meat rabbits is prohibited. The answers provided on this board are for general guideline purposes only. The information is not intended to diagnose or treat your pet. It is your responsibility to assess the information being given and seek professional advice/second opinion from your veterinarian and/or qualified behaviorist.
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I have a very territorial rabbit as well (and she is spayed). I call it her "bun-ittude". Basically, what we have done is make her things, our things. It might be a little more difficult since she is older - but I would start by spending time with her when you feed her. Maybe feed her in a separate place (somewhere new) and sit with her while she eats. I'd also try switching up her home. If it's a NIC condo - maybe switch the floors around.
My bun also will take pellets as treats one at a time from us and will gently take them from our hands - which is awesome if you knew what a territorial terror she is. This has taken time but I feel like it really lets her know that we are her humans and need to be respected. The only time she gets aggressive now is when my boyfriend is torturing (/he thinks he's "playing") with her and she will nip. But - that's what he gets and that's a whole different story.