Yes, referring more people to the airdrop will increase your chances of getting higher rewards. This is because the more people you refer, the more people will join the airdrop and the more rewards you can get. By referring more people, you are also increasing the overall pool of participants and thus increasing the rewards for everyone involved. Additionally, the more people you refer, the more likely it is that those people will refer other people, thus increasing the pool of participants even further. So, if you want to maximize your chances of getting higher rewards, make sure to refer as many people as possible.