Few things that help me everytime:
1. S Pen - really helps in taking those perfect selfies! Especially if your hand tends to shake by reaching the shutter button (which you can also move!)
2. Viewfinder grid lines - sometimes it's all about balance and symmetry! The grid lines could definitely help you finding that perfectly balanced photo!
3. Ultra-wide - the best thing that ever happened to phones! Ultra-wide lenses! Though not as useful at night, but with good lighting, you might want to play with normal photo and ultra wide to see what suits best