You actually "add" it to metadata of asset pack BUT you also added to the description the following paragraph:
"LICENCE:
This asset pack can be used in free and commercial projects. You can modify the assets as you need. Creditting is not necessary, but deeply appreciated! Use Raphael Hatencia for creditting. You may not repackage, redistribute or resell the assets on their own, that includes NFTs, just images, or asset compilations."
1. CC-BY 4.0 allows any redistribution
2. Credits are necessary
I am not good at licenses maybe it also has some other incompatibilities between them but you should decide... Is it cc-by 4.0 or your own proprietary license