Kinematic behaviour object but with gravity ???

If someone need a quickFix, that work for me ( PlayerManager.Instance.gameObject is the player gameObject):

     private void OnCollisionEnter(Collision collision)
     {
         if (collision.gameObject == PlayerManager.Instance.gameObject)
         {
             GetComponent<Rigidbody>().isKinematic = true;
             GetComponent<Rigidbody>().useGravity = false;
             GetComponent<Rigidbody>().velocity = Vector3.zero;
             GetComponent<Rigidbody>().angularVelocity = Vector3.zero;
         }
             
         
 
     }
 
 
     private void OnCollisionExit(Collision collision)
     {
         if (collision.gameObject == PlayerManager.Instance.gameObject)
         {
             // switch to 'non-kinematic'
             GetComponent<Rigidbody>().isKinematic = false;
             GetComponent<Rigidbody>().useGravity = true;
             GetComponent<Rigidbody>().velocity = Vector3.zero; // or another initial value
         }
 
     }

STILL INTERESTED IN A BETTER SOLUTION