I would stop the alfalfa and switch him to a grass hay like timothy, orchard, etc, that you free feed(never let it run out). He doesn't need all of the extra protein and calcium that alfalfa hay has, plus the excess calcium can sometimes cause health issues.
You will need to monitor his hay consumption. Rabbits fed alfalfa hay can become a bit picky because it tastes really good to them, and they often don't transfer onto grass hay very well after switching off the alfalfa. If he doesn't eat the grass hay that first day, you may have to try the transition slower by mixing alfalfa hay with the grass hay and gradually decreasing the amount of alfalfa each day for a few weeks until you are able to phase it out completely. Keep a close eye on his poop to make sure it doesn't get too small. If he refuses to eat the grass hay while you phase out the alfalfa, he won't be getting enough fiber which will cause a gut slowdown(which is never good), and you might need to try a different tactic.
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