Replace Add to Cart with a Button Block

#1. Edit Footer > Add a Button Block

#2. Use this code to Code Injection – Footer

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.0/jquery.min.js"></script>
<script>
jQuery(document).ready(function($){
  $('footer.sections .button-block').insertAfter('.sqs-add-to-cart-button-wrapper');
})
</script>
<style>
div.sqs-add-to-cart-button-wrapper+.button-block {
    order: 4 !important;
}
div.sqs-add-to-cart-button-wrapper {
display: none !important;
}
</style>