Hello. I recommend that you should try Ajax Add to Cart for Magento 2 extension.
It allows customers to select product options in popup so when adding product with lots of options like configurable, bundle and grouped product, customers can stay on current page to choose options and finish adding to cart. This will be the perfect fit for your requirement.
Please contact us directly if you need further assistance.
@Sophia Walford Thank you for your interest in our extension. It has recently been updated with the new function that allows to include suggested product block in the confirmation popup. Admin can clarify which products to be included in this block: related, up-sell or cross-sell products, customize the title og block and decide the number of products displayed. See it yourself here.
Have a look at Catalog Ajax Scroll for Magento 2 by Magesolution. Catalog Ajax Scroll extension helps to load the next pages of the catalog pages automatically. As soon users scroll to the last row of the current product list, the next page is loaded simultaneously with powerful AJAX. The extension is totally useful for both shop owner and customers shopping on the site.
Particularly, this extension increases usability for your visitors by removing an extra click. The client is able to see more goods in less time without the need of searching for the 'next page' link/ button and looking around the page. It will bring about a wonderful shopping experience for all clients.
More details: https://www.magesolution.com/catalog-ajax-scroll.html
