You can follow these steps to create 2nd sticky Add to Cart bar after scrolling product pages 25%.
#1. Use this code to Custom CSS box
div.sticky-atc {
display: none;
}

#2. Use this code to Code Injection > Footer
<div class="sticky-atc"></div>

#3. Use this code to Code Injection > Footer, under #2 code
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.0/jquery.min.js"></script>
<script>
$(document).ready(function(){
$('h1.ProductItem-details-title').clone().appendTo('div.sticky-atc');
$('div.ProductItem-quantity-add-to-cart').clone().appendTo('div.sticky-atc');
});
</script>
<script>
$(window).on("scroll", function() {
//Sticky Header start
sticky = $('header#header');
if ($(window).scrollTop() > 150 ) {
$('div.sticky-atc').addClass("show");
} else {
$('div.sticky-atc').removeClass("sticky");
}
});
</script>
<style>
body[class*="type-products"].view-item .sticky-atc {
display: flex !important;
position: fixed;
bottom: 0;
left: 0;
width: calc(100% - 20px);
z-index: 99999;
justify-content: space-between;
background-color: #f1f1f1;
align-items: center;
padding: 15px 10px;
transform: translateY(100%);
transition: all 0.1s ease;
}
div.sticky-atc h1 {
font-size: 40px;
margin-top: 0px;
margin-bottom: 0px;
}
div.sticky-atc div.ProductItem-quantity-add-to-cart {
display: flex;
align-items: center;
flex: 0 0 30%;
justify-content: space-between;
}
div.show {
transform: translateY(0) !important;
transition: all 0.1s ease !important;
}
div.show .preFade {
opacity: 1 !important;
}
</style>

#4.Result
