When you're close to the money, control yourself.. watch the table and aim for the dead money. Attack mid-stacks who are tight. Attack low-stacks if you're got a hand you're willing to show-down against.
AJ -A10 are decent hands to show-down against but look at the blinds and players who raised initially.. if they're loose and if they did raise with 99/J10/KQ.. well done, good read.. good call. Missed your cards? Tough.. that's tourney variance.
However, there's another school of thought that says that you should tighten up and play PREMIUM hands coz essentially top 3.. you can wait! If and when you have a showdown and you show them you have such a premium hand.. it will do wonders for your table image.
You need to give more info about that tourney.. what were the blinds? what was the average stack? being 3rd.. doesn't mean much if blinds are really high and you are only say.. 20k more than the average stack. Remember, in an MTT.. you always have implied odds
. Each hand you play means you could lose your stack thus diminishing you chance of reaching the final table and scoring big.