After recording this piece I realised that it cuts out the volume over certain decibel and make sound very flat.
Nice playing. The video editing is done very well with the score.One thing you could do is work more with articulations and varying your tone. Your tone is mostly legato here. However, working with the various articulations indicated in the score, such as accents, tenutos, staccatos, as well as phrasing would give greater definition to the music. It is similar to when speaking, we use inflections to draw attention to certain words in a sentence. Involve more of your whole body in the playing mechanism, rather than just the fingers. Try to turn off auto gain in your recording device. Auto gain is fine for speech, but not for music. If your device allows manual gain, you will need to set it yourself. Do this by playing the loudest part of the music and make sure there is no popping or distortion in the recording - the technical term used is clipping.