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Yes its possible to have void just use a plugin for that
You can generate a void world in single player mode and upload it to Aternos then, or generate a void world using Multiverse-Core or MultiWorld, or making a void are with WorldEdit, but make sure not to overload your server, otherwise it will crash as you already experienced.
but can i generate a voidworld out of the normal world?
No, you have to create a completely new world for worldwide void.
You can use plugin for that like MultiverseCore and Multiworld plugin
Because I'm not familiar with any SkyWars plugin and thus can't give any recommendation.
MinigamesLib Open skywars And MinigamesLib download that 2 plugins, if you didnt the plugin will not work properly
wich plugin? becouse voidworld doesnt work and voidspawn doesnt work to
VoidSpawn is for sethub or setspawn
