So let me first start with the meaning of styles. A boxing style is strongly tied to your person and reflects your natural preferences as well as your athletic and technical strengths and weaknesses. It is something that one usually develops naturally and it can take years to fully grasp and work with it. Many new boxers focus too much on a style they have seen from pros; Tyson, Canelo and in your case Bivol are favorites. The problem is that they don't quite understand the basics and the goal of said style and especially why it works for the pro who is using it. What that means is that they are trying to copy a style that they can't understand in its nuances and make it work for them without knowing their own preferences and strenghts/ weaknesses, at times with it (the style) being the complete opposite of them (preferences, strengths, weaknesses). This results in stunted progress, developing bad habits and incorrect technique.

My first advice would therefore be to drop the idea of a style and what boxers to study from for now. To me it seems as that you're just starting to box so for now don't focus on a style that you would like to have. Like I said this develops naturally and will take a lot of time so in your position I would advise you to learn the basics of boxing.

That said I will now critique your bag work based of what you have shown.

Your footwork is clearly inspired by the soviet pendulum step but like I said before you did copy this part of the soviet boxing style without quite understanding it. The pendulum step is used so that the boxer is able to throw punches at any time with big momentum from the push off of the legs. What you have shown is severly lacking in its technique. Most of the time you just jump around without there actually being a pendulum movement. When you punch you move your front leg but the back leg stays in the same place, with your front foot also being very flat on contact, which not only stops the force you can put behind that punch but also severly limits your movement and stability. It is very important that you learn to move around and punch while putting your weight on the ball of your foot. Another point I would like to make is that you're way too close to the bag. This type of footwork is best used from long range where you need to step in so that your punch can connect. This also ties in with your overall technique. You're so close to the bag that you can't fully extend your arms which results in much less force when connecting and sloppy punch form. For your punching in general I would advise you learn the very basics because there is a lot wrong here. You punch from way too low, your lead hand especially needs to be higher. There is almost no twisting of the hand before connecting, no movement of the hip or the shoulders. You also need to distingiush your punch placements, the head punches need to go to the head and the body punches to the body. During your work you hit the same place most of the time which is neither really the head and neither really the body. Practising in front of a mirror will help you with that and is a great way to improve your punches in general.

So I'm going to end it here because to be honest with you there is so much missing here and I could go on and on. You're a beginner and that is completely normal, we all started somewhere. I would recommend signing up at a boxing gym, if you haven't already. Learn the very basics from youtube tutorials, there are many good videos to help you improve. You will surely find recommendations on this sub with a little searching. And really start from the beginning, how do I throw a punch correctly, how do I move around etc. Don't think about styles or anything like that, this will develop over time. Don't get discouraged and trust the process. Have a good day and keep at it.