Rarible, and superare holds regular free nfts airdrop giveaways,

 To enter NFT giveaways, you'll usually need to perform a set of actions, such as retweeting a tweet, liking a post, or following an NFT project on social media. The giveaway rules and entry requirements will vary from project to project, so be sure to read the instructions carefully before participating. Rarible, a marketplace for buying and selling NFTs, holds regular giveaways, and users can participate by following the project on social media, joining its Telegram group, or completing other actions.