Sorry you lost your rabbit to the awful disease
Was it vaccinated and is the surviving one vacs?
If not I'd suggest taking your vets advice on when to get it and your others vacs
As you have had mxyi on your property it is advisable to use quarantine conditions for at least 4 weeks..preferably 6
This means you change your clothes before seeing to the buns and change out of them after..disinfect more than normal and flea treat your bunnies and their living areas..again take vets advice on carrying this out.
Do not allow anyone else who owns rabbits to go anywhere near yours, or for you to go near other owners until you have changed out of any clothes which may have had contact with your rabbits.
I would fit fly nets to front of hutches as can cut risk.
Also do not introduce another new rabbit to your area until the quarantine period is up.
Watch out for signs of illness in your others, I hope they all stay clear.
When you do get another..as I think your lonely bun would benefit from a new partner...make sure it has had a mxyi vacs at least 8 days BEFORE you bring it home
Keep up to date with your vacs for all your bunnies and reg treat with insect repellents/flea treat and continue the use of fly screens
Hope all your other bunnies stay well and you are able to find a new partner for your now solo bun in a few weeks time