How to change a room?

Hello there,
i'm searching for the recommended way to switch a room. So i already tryed out some things and got a result i'm not really happy with. I create a room when i join the game. Then i want to switch into another scene and create a new room with a properties room name, after joining the new room the other players still can see my character in the old one.

Here is my setup:

Joining into the world for the first time:

public class NetManager : Photon.MonoBehaviour
{
    public virtual void Start()
    {
        PhotonNetwork.ConnectUsingSettings("v1.0");
    }

    public virtual void OnConnectedToMaster()
    {
        Debug.Log("OnConnectedToMaster() was called by PUN. Now this client is connected and could join a room. Calling: PhotonNetwork.JoinRandomRoom();");
        PhotonNetwork.JoinRandomRoom();
    }

    public virtual void OnJoinedLobby()
    {
        Debug.Log("OnJoinedLobby(). This client is connected and does get a room-list, which gets stored as PhotonNetwork.GetRoomList(). This script now calls: PhotonNetwork.JoinRandomRoom();");
        PhotonNetwork.JoinRandomRoom();
    }

    public virtual void OnPhotonRandomJoinFailed()
    {
        Debug.Log("OnPhotonRandomJoinFailed() was called by PUN. No random room available, so we create one. Calling: PhotonNetwork.CreateRoom(null, new RoomOptions() {maxPlayers = 4}, null);");
        PhotonNetwork.CreateRoom(null, new RoomOptions() { MaxPlayers = 4 }, null);
    }

    public virtual void OnFailedToConnectToPhoton(DisconnectCause cause)
    {
        Debug.LogError("Cause: " + cause);
    }

    public void OnJoinedRoom()
    {
        Debug.Log("OnJoinedRoom() called by PUN. Now this client is in a room. From here on, your game would be running. For reference, all callbacks are listed in enum: PhotonNetworkingMessage");

        if(GameObject.FindGameObjectWithTag("Player") == null) // Prevent from spawning the player again (because it's not getting destroyed on Load)
        {
            GameObject.Instantiate(playerPrefab, Vector3.zero, Quaternion.identity);
        }

        // Create the player head
        CreatePlayer();
    }

And here is the script that gets called after switching into the new scene:

public class NetManagerArena : Photon.MonoBehaviour
{
    public virtual void Start()
    {
        PhotonNetwork.ConnectUsingSettings("v1.0");
    }

    public virtual void OnConnectedToMaster()
    {
        Debug.Log("OnConnectedToMaster() was called by PUN. No arena room available, so we create one. Calling: PhotonNetwork.CreateRoom(null, new RoomOptions() {maxPlayers = 2}, null);");
        PhotonNetwork.JoinOrCreateRoom("arena", new RoomOptions() { MaxPlayers = 2 }, null);
    }

    public virtual void OnJoinedLobby()
    {
        PhotonNetwork.JoinRoom("arena");
    }

    public virtual void OnPhotonRandomJoinFailed()
    {
        Debug.Log("OnPhotonRandomJoinFailed() was called by PUN. No random room available, so we create one. Calling: PhotonNetwork.CreateRoom(null, new RoomOptions() {maxPlayers = 2}, null);");
        PhotonNetwork.CreateRoom("arena", new RoomOptions() { MaxPlayers = 2 }, null);
    }

    public virtual void OnFailedToConnectToPhoton(DisconnectCause cause)
    {
        Debug.LogError("Cause: " + cause);
    }

    public void OnJoinedRoom()
    {
        Debug.Log("OnJoinedRoom() called by PUN. Now this client is in a room. From here on, your game would be running. For reference, all callbacks are listed in enum: PhotonNetworkingMessage");
       
        CreatePlayer();

    }

How the scene change gets called:

private void ChangeScene()
  {
        PhotonNetwork.DestroyPlayerObjects(PhotonNetwork.player);
        PhotonNetwork.LeaveRoom();
        PhotonNetwork.Disconnect();
        SceneManager.LoadScene("Arena");
  }