I think an addition of some sort of drum layer would really aid this track. I think the notes alone don't give it a sense of fast paced, but adding some sort of constant pulse would really help it feel that way! I'm also curious of how it would sound if you keep the notes the same and add the pulse. Might give it a more lop-sided feel where the melody clashes with the beat, maybe giving it a more "lopsided" feel.