Simple Way To Block AdBlocker For WordPress Without Plugin - https://www.techmuzz.com/how-to/wordpress/simple-way-to-block-adblocker-for-wordpress-without-plugin/

blockadblocker.js

window.onload = function(){ 
    setTimeout(function() { 
        var ad = document.querySelector("ins.adsbygoogle");
        if (ad && ad.innerHTML.replace(/\s/g, "").length == 0) {
            alert("Please don't use Ad blocker on this site.");
            var x = document.createElement("IMG");
            x.setAttribute("src", "https://www.techmuzz.com/wp-content/uploads/2018/12/stop-ad-blockers.png");
            x.setAttribute("width", "750");
            x.setAttribute("height", "415");
            x.setAttribute("alt", "Please don't use Ad blocker for this site.");
            document.querySelectorAll("article").forEach(function(e) {
                e.parentElement.appendChild(x);
                e.remove();			  
            });
        }      
    }, 2000);
};