if a new(-ish) GM asked me what is the one thing to do to make his/her game better, I would recommend working on managing framing and consequences to maintain player engagement, rather than (say) working on the portrayal/characterisation of NPCs.
That is true if TRPG is literary, and it is also true if TRPG is not literary.
 
				 
 
		
 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		