I bought my son a royal and we did what almost every first time buyer does; We bought a glass tank and heat lamps. Luckily I went form not being much interested in snakes to becoming very interested in them and went on to research various biological studies, and read and continue to read a great many other texts, studies of general and species specific literature.
I'm not sure the age of your royal but yes, the tank is too big. You, and more importantly the snake would benefit if you'd wrap the sides and back of the tank, preferably with some type of insulation material like reflectix. Not only will this assist with heat and humidity, it will make the tank more secure for the snake. You can certainly put a nice background wrap around it before you insulate it. It will be much more visually pleasing.
As mentioned your snake is using probably the worst hide in the tank, and it is for reasons mentioned above.
There is a thread here on how to set up a glass tank by THE SERPENT MERCHANT. I strongly recommend you read it.
Here's another little tidbit you may or may not like or be able to accomplish. We moved the royal's tank down to the basement snake room, where it is dark, and there is almost zero human or animal traffic except when I'm down feeding or observing them.
That move made a big difference in the snake's behavior. The once boring royal is out every night doing her thing and moving about which is what a nocturnal animal should do. Prior to that we'd rarely see here out.
It understandable that you may not have that option, or may want the snake in a room you are in often.
Personally, I'd look into cypress mulch substrate or coco husk. Even aspen will allow your snake to burrow if it's insecure.
There is a lot to digest here, and I could go on, but start with making that large tank as small as you can by "darkening out/wrapping" the sides like I mentioned and get the equipment others above have mentioned.
It's not difficult, and you will see improvements.
Good luck.
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