Is there a possibility to show the “Add to cart” button permanently in the product loop on the shop page? Also for external products? I just found the “Quick view” and “Add to cart” buttons while you hover over the product’s thumbnail.
You’d need to investigate the WooCommerce files in Polestar, see where the buttons have been removed, add them back and check where the hover buttons have been added and remove those. CSS changes have to be made too.
Codeable.io is a good option if you’d like to find a developer to assist with a once off task. It’ll be faster than hiring on Upwork which requires more vetting in the hiring process.
Please, find a child theme here to help. You can see the customisations made in functions.php and style.css. Hope that helps.