There is really no need to submit one texture at a time. Would you be willing to add all the textures to one submission?

No one is forced to download them all at once. Individual texture files can be attached to a single submission, allowing people to download and preview them individually even when submitted together. Furthermore, textures specifically are automatically subdivided for categorization, even when submitted in a single packed .zip file. For example: https://opengameart.org/content/seamless-2

Note that only a single .zip file is shared in the Seamless 2 submission, yet each individual texture can still be reviewed and downloaded separately. Also note the primary preview image contains a summary of all textures, not just a single one, thus both each individual texture can be previewed as well as all the textures in the pack at the same time.

However, if you do not feel the textures should be categorized together, that is your prerogative. My intent was to offer solutions to your flooding of the site with individual submissions, which tends to trigger the sites anti-spam countermeasures. See also: https://opengameart.org/comment/99559#comment-99559

Alternatively, you can upload individual textures to separate submissions as you've done, but over a longer period so as not to trigger the site's "panic".

Or you may also wait until there are enough to categorize them efficiently and upload them as packs, as you've mentioned above. Your call. Hope that helps. :)