Hello,
You’re going to need a GAME INSTANCE.
A BP_GAMEINSTANCE will act as a GLOBAL BLUEPRINT that will allow levels to communicate with one another.
It’s a MIDDLE MAN.
The reason you don’t want levels to directly communicate with one another is because unforeseen runscript can occur.
Just make sure that when you do create a GAME INSTANCE, you set this instance as default in the editor settings (or you can use the default):