How to make a Variable in a Blueprint Accessible in other Blueprint

I can spawn the actor but if I do it from the player. Each player is able to spawn their own version when I just want one shared actor. If I spawn it from the level or basically anything else, I can’t access it. I’m currently trying to cast to it from the player but I don’t know what object I should use in the cast. I tried get component by class already and that didn’t work. I’ve gotten spawning/despawning to work but I can’t ensure that all players will control one spawn so I’ve turned my efforts towards one actor in the level and then the players being able to set the visibility. I’ve looked at tutorials and can’t find what my object needs to be in order to complete the cast.