[at_]

Fantastic resource! I actually stumbled across it organically a few months ago, and couldn't believe my luck. There's really nothing else out there as high quality that's CC0. So thank you.

[r1chardnl]

You could try https://polyhaven.com/

[fodi]

Quaternius[0] and Kenney[1] also has lovely low-poly 3D models, all under CC0.

[0] https://quaternius.com/

[1] https://kenney.nl/assets/category:3D

[tolgaarslan]

You can also use 3dassets.one It let's you search 3D assets based on the license or creator.