Question "Super MonkeyBall" inspired final assignment

So as the title says, I'm making a 3D Super Monkeyball inspired game as my final assignment for school, I'm learning everything I can from youtube and forums but I still have very specific questions, hope I can get through before my due date. My main problem is the following:
I'm trying to control my player and make the camera rotation relevant to the player movement.. for example, I'm moving forward and I rotate my camera to the left and instead of the ball turning to the left it keeps moving forward, same thing if I rotate the camera to the front, when I move forward it looks like I'm moving backwards...

My movement script is very very simple
public class Sc2 : MonoBehaviour
{
[SerializeField]
Vector3 v3Fuerza;
[SerializeField]
KeyCode keyPositivo;
[SerializeField]
KeyCode keyNegativo;

void Start()
{

}

void FixedUpdate()
{
if (Input.GetKey(keyPositivo))
GetComponent<Rigidbody>().velocity += v3Fuerza;

if (Input.GetKey(keyNegativo))
GetComponent<Rigidbody>().velocity -= v3Fuerza;

}
}
(I copied this same script for the left and right movement)

And the rotation script that is attached to the main camera is
public class PlayerFollow : MonoBehaviour
{
public Transform PlayerTransform;

private Vector3 _cameraOffset;

[Range(0.01f, 1.0f)]
public float SmoothFactor = 0.5f;

public bool LookAtPlayer = false;

public bool RotateAroundPlayer = true;

public float RotationsSpeed = 5.0f;

void Start()
{
_cameraOffset = transform.position - PlayerTransform.position;
}

void LateUpdate()
{
if(RotateAroundPlayer)
{
Quaternion camTurnAngle =
Quaternion.AngleAxis(Input.GetAxis("Mouse X") * RotationsSpeed, Vector3.up);

_cameraOffset = camTurnAngle * _cameraOffset;
}
Vector3 newPos = PlayerTransform.position + _cameraOffset;

transform.position = Vector3.Slerp(transform.position, newPos, SmoothFactor);

if (LookAtPlayer || RotateAroundPlayer)
transform.LookAt(PlayerTransform);
}
}

So, if there's a solution for this with what I have already that would be ideal but I am open to learning and any other recommendations, thanks in advance.