Do it like Fallujah, give the civilians an ultimatum to leave.
Then let the 155mm fire at will. The USA already set the precedence.
That's actually something like what I was going to suggest. We took down houses in Fallujah with 120mm grapeshot, basically point blank. Lots of demo charges. Lots of shooting people less than 50ft away. Was quite the rebuke of the suggestion the US military can only fight with high tech toys. A few weeks into the 2nd Battle of Fallujah the chatter between all the AQI and jihadi was "this ain't working, the Americans aren't stopping and we're not killing enough of them" so the tactic is sound. Still. Big differences are drones and more developed tunnels, rather than holes knocked into walls. Fallujah was loaded with drugs too, those guys were cooked up on speed, adrenaline, meth, all kinds of stuff. I doubt Hamas allows that. Operation Phantom Fury didn't involve dealing with the taking of hostages either, and this certainly will.
I do worry about IDF restraint though. The US military tries to avoid collateral when they can, I'm less familiar with the efforts of others, or the conviction behind it. As I said earlier, not a fan of religion entering war. People like Bibi give terrorists ample recruitment though. You destroy communities long enough and pretty soon people want to return the gesture.
I weep for the innocent secular
and religious folks on both sides who wanted no part in this. I also don't expect people to stand by and do nothing when their families and neighbors are being assassinated and kidnapped. I wouldn't. Just like Fallujah, you can tell who the bad guys are by who is jubilantly parading around the lifeless corpses of their enemies. Maybe some of you remember the event that caused Operation Vigilant Resolve.