So now what for Israel?

So Israel has reached a truce in the Gaza without ever getting its soldier back.  Five months of “war” was apparently inadequate to either find and release that soldier or persuade the Palestinians to give him up.  Looks like Israel, like the United States, has gotten into the bad habit of entering “limited” wars and then pulling out without achieving its objective.  This strikes me as a bad thing, but I do not have the expertise in thise area that Bookworm or her readers do.  What do all of you think Israel should do now?