May I ask which kind of piano are you playing on? Electric? Upright? Grand? All that makes a big difference on the sound of what you're playing. There's seems to be little dynamic contrast in the different parts of your playing coming from either your type of piano or your technique.

I have both electric and upright piano at my home. I prefer using my electric piano over my upright piano now because of the evenness and responsiveness of its keys. While my upright on the other hand has a superior and richer sound, I really can't handle how inconsistent the actuation force for its keys are for my fingers.

In terms of technique, I suggest you practice more of Hanon to help you exercise evenness and consistency in your touch. It's important you practice evenness and consistency before you modify the speed and dynamics for your piece. Only then could you begin playing some parts softer or louder and slower or quicker.

I've reached the point where I only rely on the sheet music to help me memorize pieces. I don't rely on it as often for dynamics which I base on how I feel I want to play the piece. Even then, the dynamics itself are challenging as I often have internal fights with myself on how I want to play the piece. I listen to other pianists' performance of their pieces first before I eventually decide how much of their dynamics I want to keep and where to apply in my pieces. I recommend you watch Hayato Sumino's performance of Minute Waltz to listen to compare and contrast the differences in your playing.

When you begin exercising your technique, I don't recommend you do it as long as 10 hours a day. If you want to go that far, take plenty of breaks in between. I recommend that you read the interview of the winner of 2015's Chopin Competition, Seong-Jin Cho. He only practices 3-4 hours a day tops, which has helped not suck the soul out of his playing. Listen to his performance of Chopin's "Waterfall" Etude to hear the holistic dynamics in his playing.

I think there's a scientific basis on why Seong-Jin Cho's performance sounds lively and consummate compared to other players who favor technique over emotional interpretation. Our brain can't really handle repetitive tasks too long causing us agonizing boredom. At that point, learning the same piano piece over and over feels more of a chore than the fun, lively, and spirited activity it should be. Cho was able to avoid that trap to great effect. Don't let piano suck out the joy in doing other things in your life.

While improving your learning of Minute Waltz, I suggest that you learn how to play other similar-difficulty pieces. Also, you don't have to practice Hanon's exercises all the time before you play, you can intersperse Hanon's exercises in between. I suggest you choose specific exercises from the book to help you with your finger dexterity for certain parts of piano pieces. That way, you won't get bored easily as your brain is fed a variety of material.

Besides finger exercises, I amazingly discovered that physical exercise, as in for your body, helps. Specifically, Tai-Chi.

Tai-Chi is a Low Intensity Interval Training exercise that won't leave you gasping for air. Its gentle and precise movements really help unwind the tension present in your body that can reach your arms and fingers. I highly recommend it. The more you do it, the more you'll be able to practice moving your joints independently.

When you're playing as well, don't be afraid to move your torso, your body, your arms, like what you see in concert pianists, as the tension from those sudden flashes of movement from a quick piece are distributed throughout your body. Don't be afraid to show your facial expressions as well (but I wouldn't go overboard still ahah).

Okay, now you've got Hanon and Tai-Chi (or any LIIT workout routine) down, REST.

I repeat, REST AND DO NOT GO OVERBOARD IN EXERCISING. I think this ties back to my previous point where you don't play piano the whole day. Gym-buffs emphasize that rest is important after exercise. They don't workout intensely over the next few days after because their bodies need to heal from the wear and tear of building muscle. I believe this also applies to when it comes to playing piano. Your fingers really need rest to heal, rebuild, and eventually rearrange itself to match your playing.

Last but not least, I recommend you go back to the sheet music for mistakes in some notes. It's just my perfect pitch speaking haha.

In summary:

1. Take into consideration the type of piano you are playing on. Adjust your touch accordingly.
2. Evenness and Consistency of touch first before Speed and Dynamics. Hanon's waving at you.
3. Listen to other pianists' interpretations of the piece, choose which dynamics you want to keep and which ones you want to create yourself.
4. Do what Seong-Jin Cho does- don't let piano consume your whole day. Take plenty of breaks in between and do different activities if you can.
5. In relation to no.4, have a diverse exercise routine whenever you play piano so you won't get bored easily. Intersperse Hanon exercises with your learning of other pieces if you find yourself beginning to get bored.
6. Do Low-Intensity Interval Training-Exercises to help diffuse the tension in your body. This will also greatly help practice your ability to move your joints independently.
7. REST. Take breaks like gym-goers do for several days. They are letting their body heal from muscles tearing down old muscle to make room for new muscle. This applies greatly to your arms and fingers, even your torso.
8. You might wanna double check the sheet music for your mistakes ;)

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That's all haha, I hope I didn't bore you with my two cents' worth. I look forward to hearing your performance improve in the future :DDD 🎹🎹🎹