Hi! Here are some few tips, hope it helps
1) You need to be active here, post discussion, interacting with everyone etc
2) You need to post detailed reviews here on picky too! I see you haven't done any review yet so that's a starting point. You can review on any products that you currently have and have used already and post it in Picky in the specific product space.
3) Sometimes the giveaways are based on luck's and location, our chances of winning is higher when it's mega giveaways where usually they pick thousands and thousands of winner.
I wish you best of luck's in the future! Take your time, you will win soon!