I know that a good way of enriching your writing is to include a range of emotions, obviously following a flow, and making sure it makes sense overall, not just cycling through them just to check them off a list. But another important thing is to have a consistent and cohesive tone/mood/atmosphere. (I'm not sure what specifically would be the best word here, but one of them.)
The overall feel I'm going for is quiet, introspective and almost bittersweet. How can I make sure my writing is consistent without feeling too same-y?