Why is not this working?

// Counter program
const decrease = document.getElementById("decreasebtn");
const reset = document.getElementById("resetbtn");
const increase = document.getElementById("increasebtn");
const countlbl = document.getElementById("myH13");
let count;

countlbl = Number(countlbl);

decrease.onclick = function(){
    count--;
    countlbl.textContent
}
increase.onclick = function(){
    count++;
    countlbl.textContent = count
}