@5000101 First, don’t enable the send button by default.

Then , try this:
$w.onReady(function () {
$w("#name").onChange(() => updateSubmitButtonStatus())
$w("#email").onChange(() => updateSubmitButtonStatus())
$w("#phone").onChange(() => updateSubmitButtonStatus())
$w("#problem").onChange(() => updateSubmitButtonStatus())
$w("#tellUs").onChange(() => updateSubmitButtonStatus())
});
function updateSubmitButtonStatus() {
if (($w("#name").valid == true) && ($w("#email").valid == true) && ($w("#phone").valid == true) && ($w("#tellUs").valid == true)) {
$w("#push").enable()
}
}