Do you have spare time to fill? The best way to do it is by visiting the Amazon Giveaways page:
https://www.amazon.com/ga/giveaways/
And start clicking! There’s literally thousands of prizes you can enter for. New prizes are being added throughout the day. A lot of them are instant-win giveaways. There are so many prizes available that there’s no way you can enter them all. Good luck!