Just the 3D particles are not good enough to get an approval. It has almost no design, flat text with no effects or something that makes it look better, in my oinion motion should flow and your work is not smooth at all, no background (just all white). There´s no New Year/Holiday style or “spirit”. Color combination is not the right one, same about the text font (at least from my point of view). No music either.
I hope this helps.
I agree with @GoForMotion. He wrote everything correctly. If you don’t see the mistakes he wrote to you about, then you are simply not ready to make a quality product. Do not get me wrong, I in no way want to be rude. But it is impossible to explain all these points in more detail. Moreover, design is, to some extent, art. And art is subjective thing, and cannot be written down by formulas. Design needs to be felt. And it comes with experience. If you do not feel the difference between your project and the projects that were approved on Videohive, then you need to learn a little more about design, analyze the market. Ideally, you need to graduate from a motion design institute. But you can also take online courses, or watch YouTube video tutorials. Any way, if you want to become a professional, you need to approach this very seriously.
Wish you luck, mate!
I don’t know what country you are from and what language you speak, therefore I don’t know what language you are going to watch online courses. Just google it. Also explore the Envato market. See what’s popular and trending right now, what the buyer needs, etc… Also constantly inspired by motion design on Behans, Vimeo, etc…
Over time, understanding will come of what needs to be done. My first project was also rejected. I could not understand why. But after some time, the reason became obvious to me