Making a Map System

Hi everyone,
I am trying to think of a good flexible method to making maps in games. I have been developing a Metroidvania style 2D platformer for awhile now and everything is going well but I am very unhappy with the map system. I have a 'map camera' that turns on and overrides the main camera when the game is paused. Rooms the player has entered will trigger the map overlay to turn on and thus be visible on the map camera.

While this system works it feels clunky to me and could be improved. Just wondering what some better alternatives would be. Every resource I have found for Zelda or Metroid styled maps has been for set up the tiles rather than the actual literal in game map.

Any and all assistance would be great! Thanks!