one strategy you can start using is to wait until there are only a few hours before predictions deadline, then snipe the bitcoin price at that time.
if the price does not go up and down much in the following days, you will have a higher chance to win.
That’s a good strategy, but personally, I believe in the "wisdom of the crowd" theory and tend to apply it whenever I participate in prediction contests (whether it’s a bitcoin price prediction or anything else).