(a) Their "offers" are unacceptable because the involve returning the hostages over the span of months, not days. (b) the last time Hamas and Israel had a ceasefire, Hamas broke the ceasefire by attacking Isreal on October 7th. (c) Hamas are losing this war, very badly, and are not in a position to dictate their terms on Israel.
If you want a ceasefire, and you should, stop defending Hamas and start realizing that they are the ones who need to surrender and release the damn hostages. God damn.