DestroyFinishedPartical.cs

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

public class DestroyFinishedPartical : MonoBehaviour
{
    private ParticleSystem thisParticleSystem;
    // Start is called before the first frame update
    void Start()
    {
        thisParticleSystem = GetComponent<ParticleSystem>();
    }

    // Update is called once per frame
    void Update()
    {

        if (!thisParticleSystem.isPlaying)
        {

            if (gameObject == null) return;// Check if the game object is null

            Destroy (gameObject);
        }
    }

    void OnBecameInvisible()
    {
        Destroy(gameObject);
    }
}