You are playing the correct notes at a suitable tempo, but your interpretation is not sensitive yet. The problem is the dynamics. The major sevenths should produce a nostalgic, longing effect, and that cannot be achieved if you play them the same straightforward way as a consonant chord in a march.
The five opening notes are supposed to be quiet and wistful, almost like a whisper coming from silence, but they are currently loud and even. The right-hand melody is fine, and the bass notes are gently prominent; but the repeated notes in the left hand should be much softer, not much more than a murmur, and even the melody should be only mp. Other than that your performance is nice.
It might be easier to achieve a full variety of dynamic levels on a real piano, but this model has weighted keys and adjustable touch, and in any case one hears insensitive performances on expensive real pianos all the time.
Your digital piano has by default a very piercing, "bright" sound which could exaggerate dissonances. You may want to adjust the treble response; look at your manual for information about EQ adjustment. If you are having trouble playing pp, you should also adjust the touch settings.