Tell Spire what you want to play and it sets up the pack below: styles, difficulty and mods. Keep talking to change it. Every mod still gets tested for real.
Building packs from the website opens soon. Pick your styles and mods now: the link keeps them.
Untick anything you don't want, add single mods from other styles, or search for any NeoForge 1.21.1 mod. Whatever you pick, the build plays the whole pack for real and fixes or removes what breaks it.