Just keep trying although if I’m not mistaking I won just once and ever since then no win yet but, will I stop predicting? No. It’s actually nice seeing free prediction contest taking place and many have gotten the opportunity to win more times, sometimes it’s not about luck rather the ability to know the strength of both teams probably it might help, wishing everyone good luck.
It's all literally just free money for a couple of minutes of effort which is why many people including me love these contests. They depend more on luck than skill based on my observations over time.
Have won several such contests myself over several years in this forum and am looking forward to winning more later on.
Prediction games is based on knowledge and luck, and not skill, the player need or require good playing skill to win the match against their opponent, while we the watchers and speculators need knowledge of which team is stronger than the other, and have better chances of beating the other, we need this knowledge to become better predictors and also to increase our chances of prediction correctly most of the time.
And as for the prediction contest being held on this forum, its free money like you have said, since participants are not being made to stake any thing of value except just post their prediction of which team they think will beat the other in a coming match.
So, win or loss, it's fun to participate in such contest, since the loss isn't actually a loss in reality, the loosers simply weren't knowledge and lucky enough to get the free money.
However, I will keep participating, and who knows? I might win a prize that I can use to make some bets on some games or play some slots. It's been some time since I have played slots. It can be fun. 
