Thanks for your comments, you can freely use this asset in your projects, it is only required to mention the authorship of the assets, greetings!!!
So is it CCBY4? https://creativecommons.org/about/cclicenses/
Yes
You should add the license into metadata for the asset packs: "Edit asset pack->Metadata->Release Info->License for assets" It will increase the size of audience that will be able to find your art
