You should add the license (but to do it you need to use 4.0) into metadata for the asset pack(s):
"Edit asset pack->Metadata->Release Info->License for assets" It will increase the size of audience that will be able to find your art
Viewing post in Clean and Cubed Building Pack comments
Just one small correction for description: 4.0 versions don't have "ported" and other version for other countries. 4.0 just exist https://creativecommons.org/version4/