Tried out NovaFX Shader on 1.21 and was seriously impressed. It works with RenderDragon, which is already rare — and somehow still looks vibrant and runs smooth.
Gave OSimplicity (Vibrant Visuals) a try on Bedrock and it’s actually a really clean look. It’s not one of those heavy shader packs that melts your device — just bright, smooth visuals that make the game feel more colorful without overdoing it.