The most they can do now is guerilla warfare. Any attempt to move organised troops in the following days will be swiftly dealt through by Israel's airforce. This means that movement of big number of Hamas troops will stop because they will be easily spottedRetreat would be the worst thing Hamas can do, as they have nothing to counter Israeli air power. Pull back and the Israelis can bomb them from the air with impunity and safety all the way back to the Stone Age.
This is a once-a-century chance for them, having somehow managed to catch the IDF out cold, they are now through the Israelis main defences and in their urban settlements, which massively limits the IAF.
This isn’t a war, the Palestinians cannot win this, it’s all about doing as much damage and causing as much pain as possible to the Israelis before they are defeated and killed.
I think the Palestinians knows this deal, and went in with clear eyes about the final outcome. This is why they won’t behave like a conventional military and try to hold ground and consolidate their gains. I don’t think they will even try to take back any of the heavy armour they have captured and will just torch them all on the spot, or drive them forwards to help push deeper into Israel.
All the initial movements of trucks full of Hamas soldiers happened because Israel was caught sleeping in the wheel.