I want to change the script so that it will automatically load after the page is fully loaded, but it does not work for me.

I tried like this

<script type='text/javascript'>
//<![CDATA[
var la=!1;window.addEventListener("load",function(){(0!=document.documentElement.loadTop&&!1===la||0!=document.body.loadTop&&!1===la)&&(!function(){var e=document.createElement("script");e.type="text/javascript",e.async=!0,e.src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-ххххххх";var a=document.getElementsByTagName("script")[0];a.parentNode.insertBefore(e,a)}(),la=!0)},!0);
//]]>
</script>

But this way it opens immediately, not after the page is fully loaded.

This is how the rules work, but it is shown after scrolling, how to make it appear itself after the page is fully loaded?

<script type='text/javascript'>
//<![CDATA[
var la=!1;window.addEventListener("scroll",function(){(0!=document.documentElement.scrollTop&&!1===la||0!=document.body.scrollTop&&!1===la)&&(!function(){var e=document.createElement("script");e.type="text/javascript",e.async=!0,e.src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-хххх";var a=document.getElementsByTagName("script")[0];a.parentNode.insertBefore(e,a)}(),la=!0)},!0);
//]]>
</script>