There is no secret! It just takes persistence, patience and consistency to win. Unless you were entering sweeps somewhere else before you joined SA you really haven't been at it long enough to see wins yet. Although I don't know which sweeps you have been entering, you must consider a few things.
1) Probably a lot of what you have entered have not ended yet. You can't win until the sweeps is over.
2) Even if some of the sweeps have ended it somethings takes weeks and somethings a month or more until winner(s) are chosen.
3) After a sweeps has ended and the winner(s) chosen it is sometimes another few weeks or a month or more until the winner(s) are notified.
Just hang in there! You will win but you must give it time. And speaking of time, the IW sweeps are strictly a matter of timing. Sometimes winners are not notified, the prize just shows up at your door or in your mail box.
There have been a few new sweepers that have thought checking off the sweeps check box next to the sweeps listing would enter them ... nope! You must click on the link and fill out the entry form. (I only mention this because I would hate for you to think your were entering something you weren't).
But really, you WILL win! Honest!!! you will you will you will .... good luck!