In the major rooms, often users end up without enough space to draw when there are more than 20+ users or so.
To solve this issue, room owners tried to manage multiple rooms at the same time, which does help, but it fragments the user base of the room, mostly leading to users prefering to join the crowded room with other users that they know instead of trying to populate the empty room.
A possible solution to this would be making a higher resolution board. Would surely help, but we are aware that it isn't very simple to be done. Other solution (that can already be used) would be drawing in different layers, which would have as the only major problem the cursor of other users that are drawing on the other layers moving around and disturbing the activity on board.
What I suggest is adding a "secondary" board in the same room. You would click a button and it would take you to the room's secondary board, altough keeping the same chat and userlist as the "main board". Pretty much the same as drawing in different layers without the cursors, but built in a more user-friendly way. and perhaps building it somehow that it would never load both boards simultaneously, improving the memory usage (rooms with layers enabled tend to be very laggy for most users)