One possible solution to reduce the radiation indoors could be LiFi. The tech is still in its early stages but if implemented can reduce radiation risk indoors. In the future, when we connect our devices to our (secure) home networks, we could have an option to block all radiation coming to and from our devices.
But I am being optimistic. Network carriers may not be in favor of this tech.
RE: 5G Technology: Friend or Foe?