Offset problem : Convert Worldposition to Screen Position

I'm making a minimap by just using UI RawImage not Render Texture or second camera anything. Problem is the playerMarker UI RawImage doesn't show the position of the object correctly. When I move the cube on z axis, somehow it moves diagonally rather than going up and down.

The resolution of screenshot of map is 2048x1024

Here is the code:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 
 public class MiniLearnUI : MonoBehaviour
 {
     public RawImage minimap, playerMarker; //minimap-image of map
     public GameObject player; //basically the BLUE CUBE
 
     void Start()
     {
         playerMarker.rectTransform.SetParent(minimap.rectTransform, false); //so that playermarker stays inside the minimap
     }
 
     void Update()
     {
         Vector3 playerWorldPos = player.transform.position;
 Vector3 playerScreenPos = Camera.main.WorldToScreenPoint(playerWorldPos);
 
 Vector2 mapSize = minimap.rectTransform.sizeDelta;
 float aspectRatio = mapSize.x / mapSize.y;
 playerScreenPos.x = (playerScreenPos.x / Screen.width) * mapSize.x;
 playerScreenPos.y = ((playerScreenPos.y / Screen.height) * mapSize.y) * aspectRatio;
 
 playerMarker.rectTransform.anchoredPosition = playerScreenPos - new Vector3(minimap.rectTransform.sizeDelta.x / 2f, minimap.rectTransform.sizeDelta.y / 2f, 0f);
 
     }
 }
 

If you know any other method...then please let me know!!

images were ss in playmode