As of January 1, 2025 you can reduce your Unreal Engine royalties from 5% to 3.5% if you ship your game simultaneously on the Epic Games Store and other stores on PC and Android.
For more information, check out the full blog post here:
https://www.unrealengine.com/en-US/blog/catch-up-on-the-big-news-from-unreal-fest-seattle-2024#simship