Seeking cohesive Minecraft modpacks with dimensions, automation, and decoration

[Jeffrey_L]

I've been playing vanilla Minecraft for years but finally want to dive into mods to completely refresh the experience. I'm looking for recommendations for a cohesive modpack, preferably something that expands exploration, building, and tech without being overwhelmingly complex or unstable. I'm running the latest stable version of Java Edition. For seasoned mod users, what are your must-have mods or curated packs that work well together? I'm particularly interested in mods that add new dimensions, automation options, and decorative blocks, but I'm worried about performance and conflicts. How do you manage your mods and ensure compatibility, and are there any essential utility mods or launchers that make the whole process smoother?