"Perks" typically refer to additional benefits or advantages that come with a particular situation or role. In the context of NFTs and art, perks could include exclusive access to events, special merchandise, personal interactions with the artist, or other unique offerings that accompany the purchase of an NFT. These perks add value to the NFT and enhance the overall experience for buyers.
Choose perks that scale well with your time. Have the tools/technology in place to deliver on those perks. You are making a commitment to your fan, and you don't want to let them down because you have overcommitted your time and energy.