Hi there,
try:
1. Create a new Hook element and select the after_footer_widgets
hook and set your Display Rules.
https://docs.generatepress.com/article/hooks-element-overview/
2. Add this to the Hook content:
<div class="grid-container after-footer-container">
<a href="url">link text</a>
</div>
Then you can add some CSS to the site to style it and center the text.
.after-footer-container {
padding: 20px;
text-align: center;
}