I would love to see a feature that allows you to migrate an existing modpack profile to another Minecraft version without having to recreate it manually every time.
How it could work:
1- Add a "Change Profile to Another Version" option in the profile menu
2- When selected, CurseForge scans all installed mods and checks which Minecraft versions are supported by them.
3- Only Minecraft versions that have at least one compatible mod should be listed. Even if only one mod supports a version, it should still appear.
4- Each version could display a compatibility count, such as: "1.20.1 — 87/93 compatible mods", "1.21.1 — 64/93 compatible mods" Expanding a version would show: Compatible mods (that will be updated to the matching version), Incompatible mods (that will be removed). Dependencies can simply appear in the same list as regular mods, with a small "Dependency" label if necessary.
Include a checkbox such as "Create as Copy". If enabled, creates a new profile with the selected Minecraft version, keeping the same icon and settings. The profile name could automatically include the Minecraft version (for example, "My Modpack (1.21.1)"). If disabled, it converts the current profile to the selected version, updating compatible mods and removing incompatible ones.

Updating a modpack to another Minecraft version is currently a very tedious process. I often have to create a new profile, search every mod individually, and figure out which ones are compatible.