Hi LottyT
Sorry to hear the hogs stopped visiting. There are lots of potential reasons, ie. the route to your garden may have been blocked, some nearby habitat may have been removed, etc.
There’s no knowing, for sure, whether they will return, but hopefully they will. The best thing to do is make sure your own garden has as many wildlife friendly features as possible and maybe leave some food out – as you are doing. Don’t forget water as well – vitally important for hogs, all day every day. But if you do all that and there are hogs around, they are likely to visit again.
Good luck. Hope some hoggy visitors return soon.