function customInterval(query, timeInSec = 1, p = true) {
    if (elementExists(query) && p) {
        const timer = setInterval(function() {
            const element = document.querySelector(query);
            element[element.tagName === 'FORM' ? 'submit' : 'click']();
            clearInterval(timer);
        }, timeInSec * 1000);
    }
}
//example
customInterval('a.btn-main.get-link', 5, !elementExists('#ytimer > .s-btn-f'))