If you’re looking for a simpler, more time-saving solution, you could try Thank You Page Upsell by BOGOS app.
All plans, not just Plus
Highly Customizable Upsell Triggers (cart-based, Product & Collection-Based, Customer-Based triggers)
Multiple Upsell Methods for Maximum Effectiveness
Easy Setup & Management
You can test it (or even more, from free gifts, discounts, bundles, and upsells) with BOGOS. Try BOGOS (4.9 rating, 2k+ reviews) for 7-free days here!