I have a website with contact.html page and success.html page, when a client fills a form contact form pagein contact.html and submits it takes them to success.html where they see this page:enter image description here and here are the codes: contact.html
<form method="post" action="#">
<fieldset>
<div class="contact-form-group">
<div class="contact-form-subgroup">
<label class="label" for="Name">Name</label>
<input class="input" id="username" name="name" type="text" required>
<label class="label" for="email">Email</label>
<input class="input" name="email" type="email" required>
<label class="label" for="Phone">Phone</label>
<input class="input phone-input" name="tel" type="tel">
</div>
<div class="contact-form-subgroup">
<label for="budget" class="label">Expected Budget</label>
<input type="number" name="number" min="0" max="15000" placeholder="$" class="input">
<label for="time" class="label">Expected Start Date</label>
<select class="input" name="date" id="">
<option value="" disabled selected hidden>Choose</option>
<option value="Immediately">Immediately</option>
<option value="Within 2 weeks">Within a Week</option>
<option value="2 weeks">2 Weeks</option>
<option value="a month">A Month</option>
</select>
<label for="field" class="label">How did you find us?</label>
<select class="input" name="find" id="">
<option value="" disabled selected hidden>Choose</option>
<option value="recommendation">Recommendation</option>
<option value="google search">Google Search</option>
<option value="advertisement">Advertisement</option>
<option value="instagram">Instagram</option>
<option value="other">Other</option>
</select>
</div>
<div class="contact-form-subgroup">
<label for="message" class="label">Message</label>
<textarea class="input message-input" name="message" cols="30" rows="6"></textarea>
</div>
<div class="contact-form-subgroup submittion-div">
<input class="form-submit-btn btn" id="submitbutton" type="submit" value="Submit">
</div>
<!-- form submission settings -->
<input type="hidden" name="_captcha" value="false">
<input type="hidden" name="_subject" value="Contact - New submission | truenorthweb.ca">
<input type="hidden" name="_template" value="table">
<input type="hidden" name="_blacklist" value="bund, lun, fudi, fuddu, chitdu, thukal, fuck, ass">
<input class="hidden-input" type="text" name="_honey" style="display:none">
<input type="hidden" name="_next" value="https://truenorthweb.ca/success.html">
</div>
</fieldset>
</form>
success.html
<section id="success">
<div class="container flex-container success-container">
<div class="content-container">
<img class="checkmark" src="https://img.icons8.com/3d-plastilina/138/null/checked--v4.png"/>
<h1>Thank you, <span id="emptyspan"></span> !</h1>
<p>We will get back to you as soon as possible.</p>
<p></p>
</div>
</div>
</section>
I want to add the client's name input from the form into the empty span in h1 in success.html (I have marked the place in the image).
I have an incomplete js script which looks like this
var submit = document.getElementById('submitbutton')
var formName = document.getElementById('username')
var name = document.getElementById('emptyspan')
function displayName() {
var username = document.getElementById('username').value;
document.getElementById('emptyspan').innerHTML = username;
}