Haha I sometimes get de-ranked back into bronze. I hate the leagues in Starcraft II it is so hard to get out of your rank. The best way to get out of bronze I have learned is just continue to win. Like many people stated above the key to this macro. Most bronze players will build up for some type of timing push (for them). If you are able to hold that off most times people will say the "gg" and then leave or just leave without the gg.
As for me as I know how to macro and take exspands it never hurts to know some marine micro. Marine, tank will pretty much wreck any push the opponent will put at you .
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