E-Commerce Digital Products Website Design

I need a clean, conversion-focused UI/UX for a new e-commerce website that will sell downloadable digital products only—think software, templates, presets, and similar items. The full buying journey has to feel effortless, from product discovery through secure checkout and instant file delivery... (Budget: $10 - $30 USD, Jobs: Figma, Graphic Design, HTML, UI / User Interface, User Interface / IA, UX / User Experience, Web Design, Website Design)