I'm curious why you have three slingers. Do you have three pure casters in your party? As far as I know, all other classes can use a bow or a crossbow. Except for the monk, I guess, but they should be in melee range most of the time.
One option is to give a priest or mage a quarterstaff. This is an extended weapon, so if they are in the center, they can attack creatures that are in front. That way, they will shoot for the first round of the fight, then switch to the staff for melee attacks.
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