Just in case you're new to modded Minecraft, a skyblock mod pack is one where you start on a small island in the sky/void and slowly expand and progress trough the set progression line.
Now that that's out of the way, if you look trough the list of mod packs on CurseForge, you'll quickly notice that around 1/6 of all mod packs are skyblocks or skyblock-like. By their popularity we can easily say that nowadays that's what people are looking for. The only problem here is that there's no way for someone who's only interested in skyblocks to only search for them. If they search for only Magic or Tech packs (the 2 genres skyblock packs are usually in) not every single one will be a skyblock.
This is why I suggest that "Skyblock" should be a new pack genre on Curse. Though, here I'm not the one to decide that, which is why you guys should vote on this. Who know, maybe if enough people vote at the end it will be turned in to a genre