How to add max speed to 3D rigidbody?

I'm making a racing game but with flying cars (no gravity). Trying to add a maximum speed. Tried everyt$$anonymous$$ng I found online and no solution. Below is what I'm working with, no solution attempted.

  Rigidbody rb;
 
  public float AccelSpeed = 100f;
  public float ReverseSpeed = 50f;
  public float RollSpeed = 50f;
  public float PitchSpeed = 50f;
  public float YawSpeed = 50f;
 
  private Vector3 LocalVelocity;
 
  public float MaxSpeed = 5f;
 
  private PlayerInput playerInput;
  private PlayerInputActions playerInputActions;
 
  void Awake()
  {
      rb = GetComponent<Rigidbody>();
 
      playerInput = GetComponent<PlayerInput>();
 
      playerInputActions = new PlayerInputActions();
      playerInputActions.Player.Enable();
  }
 
  private void FixedUpdate()
  {
      Accelerate();
      Yaw();
      Pitch();
      Roll();
  }
 
  void Accelerate()
  {
      //Forward and backward input
      float ForwardInput = playerInputActions.Player.Accel_Decel.ReadValue<float>();
      ForwardInput *= Time.deltaTime; //converts to per second rather than per frame
 
      //Velocity Update
      Vector3 Acceleration = ((ForwardInput * AccelSpeed) * 1) * transform.forward;
      rb.AddForce(Acceleration);
 
      //Remove X velocity
      LocalVelocity = transform.InverseTransformDirection(rb.velocity);
      LocalVelocity.x = 0;
      rb.velocity = transform.TransformDirection(LocalVelocity);
  }
 
  void Yaw()
  {
      //Yaw input
      float YawInput = playerInputActions.Player.Yaw.ReadValue<float>();
      YawInput *= Time.deltaTime; //converts to per second rather than per frame
      Vector3 Yaw = (YawInput * YawSpeed) * transform.up;
      rb.AddTorque(Yaw);
  }
 
  void Pitch()
  {
      //Pitch input
      float PitchInput = playerInputActions.Player.Pitch.ReadValue<float>();
      PitchInput *= Time.deltaTime; //converts to per second rather than per frame
      Vector3 Pitch = (PitchInput * PitchSpeed) * transform.right;
      rb.AddTorque(Pitch);
  }
 
  void Roll()
  {
      //Roll input
      float RollInput = playerInputActions.Player.Roll.ReadValue<float>();
      RollInput *= Time.deltaTime; //converts to per second rather than per frame
      Vector3 Roll = (RollInput * -RollSpeed) * transform.forward;
      rb.AddTorque(Roll);
  }

}