Selenium csharp sayfayı aşağı kaydırma sorunu

try
            {
                IWebDriver driver = new ChromeDriver();
                driver.Manage().Window.Maximize();
                driver.Navigate().GoToUrl("https://www.instagram.com/");
                System.Threading.Thread.Sleep(5000);
                IWebElement username = driver.FindElement(By.Name("username"));
                username.SendKeys(textBox1.Text);
                System.Threading.Thread.Sleep(5000);
                IWebElement password = driver.FindElement(By.Name("password"));
                password.SendKeys(textBox2.Text);
                System.Threading.Thread.Sleep(5000);
                IWebElement LoginButton = driver.FindElement(By.CssSelector("button[type='submit']"));
                LoginButton.Click();
                System.Threading.Thread.Sleep(7000);
                IWebElement notnow = driver.FindElement(By.XPath("/html/body/div[2]/div/div/div[2]/div/div/div/div[1]/div[1]/div[2]/section/main/div/div/div/div/div"));
                notnow.Click();
                System.Threading.Thread.Sleep(5000);
                IWebElement notnow1 = driver.FindElement(By.XPath("//button[contains(text(), 'Şimdi Değil')]"));
                notnow1.Click();
                System.Threading.Thread.Sleep(10000);
                IWebElement ReelsClick = driver.FindElement(By.XPath("/html/body/div[2]/div/div/div[2]/div/div/div/div[1]/div[1]/div[1]/div/div/div/div/div[2]/div[4]/div/a/div"));
                ReelsClick.Click();
                System.Threading.Thread.Sleep(5000);
                while(true)
                {
                    IWebElement CommentButton = driver.FindElement(By.CssSelector("svg[aria-label='Yorum'][height='24']"));
                    CommentButton.Click();
                    System.Threading.Thread.Sleep(2000);
                    try
                    {
                        IWebElement Comment = driver.FindElement(By.CssSelector("textarea[placeholder='Yorum ekle...']"));
                        Comment.Click();
                        System.Threading.Thread.Sleep(1000);
                        Comment = driver.SwitchTo().ActiveElement();
                        Comment.SendKeys("test");
                        System.Threading.Thread.Sleep(2000);
                        IWebElement Send = driver.FindElement(By.XPath("/html/body/div[2]/div/div/div[2]/div/div/div/div[2]/div/div/div[1]/div[1]/div/div/div/div[1]/div/div[3]/div/section/div/form/div/div[2]/div"));
                        Send.Click();
                        System.Threading.Thread.Sleep(7000);
                        IWebElement Close = driver.FindElement(By.CssSelector("svg[aria-label='Kapat'][class='x1lliihq x1n2onr6']"));
                        Close.Click();
                    }
                    catch (Exception)
                    {
                        System.Threading.Thread.Sleep(5000);
                        IWebElement Close = driver.FindElement(By.CssSelector("svg[aria-label='Kapat'][class='x1lliihq x1n2onr6']"));
                        Close.Click();
                    }
                    //ÇALIŞMAYAN KISIM
                    System.Threading.Thread.Sleep(7000);
                    IJavaScriptExecutor js = (IJavaScriptExecutor)driver;
                    Actions actions = new Actions(driver);
                    js.ExecuteScript("window.scrollBy(0, document.body.scrollHeight)");
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("PROGRAM YANIT VERMİYOR!!!\n" + ex.Message);
            }

IJavaScriptExecutor js = (IJavaScriptExecutor)driver;
Actions actions = new Actions(driver);
js.ExecuteScript("window.scrollBy(0, document.body.scrollHeight)");