There are all sorts of possible reasons why the hogs aren’t visiting there at the moment. The ones you had there may have been youngsters. (I have found, usually, the hogs earliest out of hibernation are the males and the youngsters from the previous year.) The males have larger ranges than the females, and I have found here that the young males tend to gradually disburse – presumably having found ranges away from here. Their visits tend to gradually become less and less frequent. So that could be a contributing factor.
There is also the possibility that someone else is feeding on their former route to your garden, or even that their route has been blocked further back.
Some foxes do eat hogs, so unfortunately, that is a possibility. But from what I understand it is usually certain foxes who become specialists in killing hedgehogs. That behaviour would probably be passed on to their young, but, in that case, it seems unlikely that you would have had so many hogs there before. But I would certainly not want to encourage foxes and hedgehogs to feed side by side.
But it is possible that some young hogs from other areas will find you and your garden may become part of their new range. And there is also still a chance for more females to return after hibernation.
Good luck. Hope some hogs find your garden again, soon.