How do I make a smooth animation in unity

I am trying to make a map in unity in which you can zoom on the player when you press the F key. For now, I just made a simple code that allows you to move the map with WASD or arrows keys you can zoom in and out with the mouse scroll wheel and by pressing F the camera focuses on the position of the player but the animation is instantaneous. What do I have to do to move the camera progressively? Here it is the code...

 public class BigMapMov : MonoBehaviour
 {
     public Camera bigMapCam;
     public float moveSpeed;
     public GameObject player;
 
     // Start is called before the first frame update
     void Start()
     {
         
     }
 
     // Update is called once per frame
     void Update()
     {
         MoveCam();
         
         if (Input.GetAxis("Mouse ScrollWheel") < 0f) // diminuisce
         {
             bigMapCam.orthographicSize += 50;
         }
         else if (Input.GetAxis("Mouse ScrollWheel") > 0f) // ingrandisce
         {
             bigMapCam.orthographicSize -= 50;
         }
 
         if (bigMapCam.orthographicSize > 3500)
         {
             bigMapCam.orthographicSize = 3500;
         }
         if (bigMapCam.orthographicSize < 50)
         {
             bigMapCam.orthographicSize = 50;
         }
     }
 
     void MoveCam()
     {
         //Focus on the player
         if (Input.GetKeyDown(KeyCode.F))
         {
             FocusOnPlayer();
         }
 
         //Get the input
         float camX = Input.GetAxisRaw("Horizontal");
         float camZ = Input.GetAxisRaw("Vertical");
 
         //speed fix
         if (3500 <= bigMapCam.orthographicSize && bigMapCam.orthographicSize > 2400)
         {
             moveSpeed = 2f;
         }
         else if (2400 <= bigMapCam.orthographicSize && bigMapCam.orthographicSize > 1200)
         {
             moveSpeed = 4f;
         }
         else if (1200 <= bigMapCam.orthographicSize && bigMapCam.orthographicSize > 50)
         {
             moveSpeed = 8f;
         }
 
         //camera movement
         if (bigMapCam.orthographicSize <= bigMapCam.transform.position.x && (7000 - bigMapCam.orthographicSize) >= bigMapCam.transform.position.x)
         {
             bigMapCam.transform.position += new Vector3(camX * moveSpeed, 0, 0);
         }
         if (bigMapCam.orthographicSize <= bigMapCam.transform.position.z && (7000 - bigMapCam.orthographicSize) >= bigMapCam.transform.position.z)
         {
             bigMapCam.transform.position += new Vector3(0, 0, camZ * moveSpeed);
         }
 
 
         if (bigMapCam.transform.position.x > (7000 - bigMapCam.orthographicSize))
         {
             if ((bigMapCam.transform.position.x - (7000 - bigMapCam.orthographicSize)) >= 10)
             {
                 bigMapCam.transform.position += new Vector3(-15, 0, 0);
             }
             else
             {
                 bigMapCam.transform.position += new Vector3(-1, 0, 0);
             }
         }
 
         if (bigMapCam.transform.position.x < (bigMapCam.orthographicSize))
         {
             if ((bigMapCam.transform.position.x - bigMapCam.orthographicSize) <= -10)
             {
                 bigMapCam.transform.position += new Vector3(15, 0, 0);
             }
             else
             {
                 bigMapCam.transform.position += new Vector3(1, 0, 0);
             }
         }
 
         if (bigMapCam.transform.position.z > (7000 - bigMapCam.orthographicSize))
         {
             if ((bigMapCam.transform.position.z - (7000 - bigMapCam.orthographicSize)) >= 10)
             {
                 bigMapCam.transform.position += new Vector3(0, 0, -15);
             }
             else
             {
                 bigMapCam.transform.position += new Vector3(0, 0, -1);
             }
         }
 
         if (bigMapCam.transform.position.z < (bigMapCam.orthographicSize))
         {
             if ((bigMapCam.transform.position.z - bigMapCam.orthographicSize) <= -10)
             {
                 bigMapCam.transform.position += new Vector3(0, 0, 15);
             }
             else
             {
                 bigMapCam.transform.position += new Vector3(0, 0, 1);
             }
         }
     }
 
     void FocusOnPlayer()
     {
         if (player.transform.position.x <= 50)
         {
             bigMapCam.orthographicSize = 50;
 
             bigMapCam.transform.position += new Vector3((50 - bigMapCam.transform.position.x), 0, 0);
         }
         else if (player.transform.position.x > 50 && player.transform.position.x < 6950)
         {
             bigMapCam.orthographicSize = 50;
 
             bigMapCam.transform.position += new Vector3((player.transform.position.x - bigMapCam.transform.position.x), 0, 0);
         }
         else if (player.transform.position.x >= 6950)
         {
             bigMapCam.orthographicSize = 50;
 
             bigMapCam.transform.position += new Vector3((6950 - bigMapCam.transform.position.x), 0, 0);
         }
 
         if (player.transform.position.z <= 50)
         {
             bigMapCam.orthographicSize = 50;
 
             bigMapCam.transform.position += new Vector3(0, 0, (50 - bigMapCam.transform.position.z));
         }
         else if (player.transform.position.z > 50 && player.transform.position.z < 6950)
         {
             bigMapCam.orthographicSize = 50;
 
             bigMapCam.transform.position += new Vector3(0, 0, (player.transform.position.z - bigMapCam.transform.position.z));
         }
         else if (player.transform.position.z >= 6950)
         {
             bigMapCam.orthographicSize = 50;
 
             bigMapCam.transform.position += new Vector3(0, 0, (6950 - bigMapCam.transform.position.z));
         }
     }
 }