Not able to do explicit wait with WebDriverWait in C# for hamburger menu

I have been messing arround lately with selenium in c#. I have stumbled upon a problem which I am currently not able to resolve. Basically, I am trying to open a hamburger "menu" on the top-left corner of the website and hover over to its first menu item: "Loterie" which should trigger another submenu to pop up right next to the hamburger menu with some "sub-options" to "Loterie".

Scenario would be: Menu -> Loterie -> User is able to see these options: Sportka / Eurojackpot / Rychle Kacky / etc....

First, I used Thread.Sleep to accomplish my task and it worked, as shown here:

        m_driver = new ChromeDriver("C:/Users/richard/source/repos/ConsoleApp43");
        m_driver.Url = "https://www.sazka.cz/";
        m_driver.Manage().Window.Maximize();
        IWebElement subMenu = m_driver.FindElement(By.Id("header-menu")); subMenu.Click();
        IWebElement element = m_driver.FindElement(By.XPath("//*[@id='menuElem']/li[1]/a"));
        Actions action = new Actions(m_driver);
        System.Threading.Thread.Sleep(1000);
        action.MoveToElement(element).Perform();  

However, it was mentioned that this is a bad practice and that WebDriverWait class should be used instead. So I tried to use the WebDriverWait class but I am not able to get it running.

I have found couple of solutions which should be dealing with my problem, but none of them seem to be working, e.g.
Explicit waits in Selenium C# doesn't work . What is wrong?
Implicit wait Command Not Working-selenium webdriver C#
How to get webDriver to wait for page to load (C# Selenium project)

I have ended up with something like this. However, I am still not able to get it run, since with the following code only 50% of the tests runs are executed correctly for some reason.

        m_driver = new ChromeDriver("C:/Users/richard/source/repos/ConsoleApp43");
        m_driver.Url = "https://www.sazka.cz/";
        m_driver.Manage().Window.Maximize();     
        IWebElement menu = m_driver.FindElement(By.Id("header-menu")); menu.Click();
        WebDriverWait wait = new WebDriverWait(m_driver, TimeSpan.FromSeconds(1));
        var loterie = wait.Until(SeleniumExtras.WaitHelpers.ExpectedConditions.ElementIsVisible(By.XPath("//*[@id='menuElem']/li[1]/a")));
        Actions action = new Actions(m_driver);
        action.MoveToElement(loterie).Build().Perform();

Could somebody please help me?