Main Manager for Data Persistence between Scenes

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

//main manager for data persistnece between scenes

public class MainManager : MonoBehaviour
{
    public static MainManager Instance;

//variable for picking the colour of vehicles in the lesson
    public Color TeamColor;

    private void Awake()
    {
    //this is to destroy the second main manager which appears after returning to the original scene
        if (Instance != null)
        {
            Destroy(gameObject);
            return; //i forgot to add this line and only saw the mistake after reviewing for the next project
        }

        Instance = this;
        DontDestroyOnLoad(gameObject);
    }
}