The logs you provided I believe is normal for the VRChat SDK. Quest has very strict limitations which you can find here. I believe “avatar validation failed” means that these limitations are being exceeded.
To find more information about the issue with your avatar, try look in the VRChat SDK panel under Validations. If there are any red octagon exclamation marks listed inside there, this should describe the issue with your avatar. Heres a screenshot with examples of what Im talking about:
As you can see in this example, “Avatar uses unsupported shader …”, which is quite common. Quest avatars can only use VRChat/Mobile shaders, so the materials have to be duplicated, switched to something like VRChat/Mobile/Standard Lite and then added to your quest model.
Although you most likely have different errors, if you cant figure it out on your own, we are here to help! You can use snipping tool and paste a screenshot here, or type out the validation errors here 