Can I put older titles or titles that have already been published on NetGalley?

You can absolutely list backlist or already-published titles on NetGalley. Even if you are listing a newly published title on NetGalley rather than an ARC, you are still listing a new release! You can also consider putting backlist titles or the first in a series on NetGalley to build buzz for a new installment or new title. Use NetGalley creatively as part of your marketing plan!