How can I save my game data

Hi, how can I save the gamedata of my shop. I am storing the score and other numerical value or strings in playerprefs but it came to know that player prefs can only store some limited values and I want to save my shop data. In my game when the user purchase something by clicking buy the buy button changes to equip button but if the user exit the game and play again the buy button is activated again thats what I want to save. I want to prevent that somehow how can I do that.

script:

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.UI; using TMPro; using UnityEngine.EventSystems;

public class shop : MonoBehaviour { public TMPro.TextMeshProUGUI scoreText; public GameObject Item1; public GameObject Item2; public GameObject Item3; public GameObject Item4; public TMPro.TextMeshProUGUI notenough; public TMPro.TextMeshProUGUI notenough1; public TMPro.TextMeshProUGUI notenough2; public TMPro.TextMeshProUGUI notenough3; public GameObject buyButton; public GameObject buyButton1; public GameObject buyButton2; public GameObject buyButton3; public GameObject equipButton; public GameObject equipButton1; public GameObject equipButton2; public GameObject equipButton3; public float sec = 14f;

private Dictionary ItemPrices;

void Start () { scoreText.text = "Score : " + ((int)PlayerPrefs.GetFloat ("Highscore")).ToString();

ItemPrices = new Dictionary() { { Item1, 50f }, { Item2, 80f }, {Item3, 3500f}, { Item4, 5000f }, }; notenough.enabled = false; notenough1.enabled = false; notenough2.enabled = false; notenough3.enabled = false; }

public void PurchaseItem(GameObject Item) { foreach(KeyValuePair item in ItemPrices) { if (item.Key == Item) {

       float price = item.Value;
       float val = PlayerPrefs.GetFloat ("Highscore"); 
       if(val >= price)
       {
       val -= item.Value;
        PlayerPrefs.SetFloat("Highscore", val);
        scoreText.text = "Score : " + ((int)PlayerPrefs.GetFloat ("Highscore")).ToString();
            buyButton.SetActive(false);
            equipButton.SetActive(true);
        
           // Take away the cost of the item from the player's currency
           //PlayerPrefs.GetFloat ("Highscore") -= item.Value;
       }
       else
       {
           Debug.Log("not enough money");
            notenough.enabled = true;
            notenough1.enabled = true;
            notenough2.enabled = true;
            notenough3.enabled = true;
           Invoke("noen", 2);
       }
      }     
 }

}

public void PurchaseItem1(GameObject Item) { foreach(KeyValuePair item in ItemPrices) { if (item.Key == Item) {

       float price = item.Value;
       float val = PlayerPrefs.GetFloat ("Highscore"); 
       if(val >= price)
       {
       val -= item.Value;
        PlayerPrefs.SetFloat("Highscore", val);
        scoreText.text = "Score : " + ((int)PlayerPrefs.GetFloat ("Highscore")).ToString();
            buyButton1.SetActive(false);
            equipButton1.SetActive(true);
           // Take away the cost of the item from the player's currency
           //PlayerPrefs.GetFloat ("Highscore") -= item.Value;
       }
       else
       {
           Debug.Log("not enough money");
            notenough.enabled = true;
            notenough1.enabled = true;
            notenough2.enabled = true;
            notenough3.enabled = true;
           Invoke("noen", 2);
       }
      }     
 }

}

public void PurchaseItem2(GameObject Item) { foreach(KeyValuePair item in ItemPrices) { if (item.Key == Item) {

       float price = item.Value;
       float val = PlayerPrefs.GetFloat ("Highscore"); 
       if(val >= price)
       {
       val -= item.Value;
        PlayerPrefs.SetFloat("Highscore", val);
        scoreText.text = "Score : " + ((int)PlayerPrefs.GetFloat ("Highscore")).ToString();
            buyButton2.SetActive(false);
            equipButton2.SetActive(true);
           // Take away the cost of the item from the player's currency
           //PlayerPrefs.GetFloat ("Highscore") -= item.Value;
       }
       else
       {
           Debug.Log("not enough money");
            notenough.enabled = true;
            notenough1.enabled = true;
            notenough2.enabled = true;
            notenough3.enabled = true;
           Invoke("noen", 2);
       }
      }     
 }

}

public void PurchaseItem3(GameObject Item) { foreach(KeyValuePair item in ItemPrices) { if (item.Key == Item) {

       float price = item.Value;
       float val = PlayerPrefs.GetFloat ("Highscore"); 
       if(val >= price)
       {
       val -= item.Value;
        PlayerPrefs.SetFloat("Highscore", val);
        scoreText.text = "Score : " + ((int)PlayerPrefs.GetFloat ("Highscore")).ToString();
         buyButton3.SetActive(false);
            equipButton3.SetActive(true);
           // Take away the cost of the item from the player's currency
           //PlayerPrefs.GetFloat ("Highscore") -= item.Value;
       }
       else
       {
           Debug.Log("not enough money");
            notenough.enabled = true;
            notenough1.enabled = true;
            notenough2.enabled = true;
            notenough3.enabled = true;
           Invoke("noen", 2);
       }
      }     
 }

}

/*public void buy() {

if (val >= price) { PurchaseItem(); } else {

}*/

public void noen() { notenough.enabled = false; notenough1.enabled = false; notenough2.enabled = false; notenough3.enabled = false;

}