Other places to get assets like Blueprints?

Are there other places where I can get Blueprints etc. I am not talking about buying the same content from the Unreal Engine Marketplace from somewhere else but about Blueprints which are not available here but somewhere else like Gumroad. And can you recommend me some Blueprints, essentials and good systems, doesnt matter if it is specificly for “x” feature or general stuff.