Auto-click Next (no delay):
function pageReady(){
$(".main-next-button").click();
}
Auto-click Next (with delay):
function pageReady() {
$('.main-next-button').hide();
let seconds=5; // change this time as needed and leave everything else as is
setTimeout(function() {
$('.main-next-button').click();
}, seconds * 1000);
}