Noob needs help with survival mode

Hi everyone, BigNoob here

I installed teh standard edition of the game recently (on steam for 15$) and wanted to try a challenge with survival mode, but I don't have the option to activate it. Looked it up online and it said I need to get it from creation club but there's no option for it? also it says the marketplace is closed?

I tried with mods but Sunhelm and similar are for Special Edition. Any mods suggestion are really welcome.