Javascript validation

I am trying to add a validation where I verify that the mean of the distribution provided by the participant in a constant sum question is equal to an embedded data field. I managed to get the validation to work and display a message if the provided distribution does not match the desired average; however, I am struggling to get the survey to stop proceeding to the next page if the validation fails.

Here is the code I have so far:
 

Qualtrics.SurveyEngine.addOnPageSubmit(function(type) {
    if (type == "next") {  // Only run this if the user clicks "Next"

        // Define the required value from the embedded data
        var requiredStars = parseFloat(Qualtrics.SurveyEngine.getEmbeddedData("stars")); 

        // Fetch values from input fields (assuming there are 5 fields)
        var questionId = this.getQuestionContainer().id;
        var value1 = parseFloat(jQuery("#" + questionId + " input[type='text']").eq(0).val()) || 0;
        var value2 = parseFloat(jQuery("#" + questionId + " input[type='text']").eq(1).val()) || 0;
        var value3 = parseFloat(jQuery("#" + questionId + " input[type='text']").eq(2).val()) || 0;
        var value4 = parseFloat(jQuery("#" + questionId + " input[type='text']").eq(3).val()) || 0;
        var value5 = parseFloat(jQuery("#" + questionId + " input[type='text']").eq(4).val()) || 0;

        // Apply the formula: box1 * 1 * 0.01 + box2 * 2 * 0.01 + etc.
        var calculatedValue = (value1 * 1 * 0.01) + (value2 * 2 * 0.01) + (value3 * 3 * 0.01) + (value4 * 4 * 0.01) + (value5 * 5 * 0.01);

        // Round the result to the nearest whole number
        var roundedCalculatedValue = Math.round(calculatedValue);

        // Validate if the calculated value matches the required stars value
        if (roundedCalculatedValue !== Math.round(requiredStars)) {
            alert("The calculated value of your entries must equal " + requiredStars);
            event.preventDefault();  // Prevent form submission
            return false;  // Prevent further submission
        }

        // If everything is fine, allow the form to submit
        return true;
    }
});

Would really appreciate some help!