idea

You should go off from the original beat near the end when it becomes acoustic and looses its background.

you should have a pad in the back so it has kinda a rise up/depressed feeling all at the same time.

slow down the piano tempo and change the chords to something a bit more gloomy and slow along the lines of C6 or C7 on FLS.

add in some flutes, a violin or viola, and a low harp (it can sound gloomy around C4 and C3)

Hope you finish it soon.

...

add some more piano, do the same notes, but at a higher octave maybe? then do some type of hook/chorus, then go back the the riff at the begining, i dunno im just suggesting, very solid song, looking forward to another version of it!