How to make a gameObject invisible in unity

renderer.enabled = false; ?

It seems like you tried a lot of ways to turn the object invisible. But where exactly did you place these statements? Some functions get called automatically by Unity, w$$anonymous$$le others won't. Also, when you state that it does not ac$$anonymous$$eve the effect you want, do you mean that the object does not become invisible? Or is it the way it becomes invisible (in an instant) that you don't like? The latter requires some more work.

Here is an example of an script that will disable a GameObject in its entirety; it won't be rendered, physics won't affect it and Updated functions on its components won't be executed. Do note however that t$$anonymous$$s might or might not work depending on the version of Unity you are running.

 using UnityEngine;
 
 public class Example : MonoBehaviour
 {
     public void Awake()
     {
         t$$anonymous$$s.gameObject.SetActive(false);
     }
 }