I took a look at Tuneplus, and I appreciate your effort in creating this work. I think there are still some aspects to consider.
The product seems to have a popular concept, but based on my experience, it appears to be somewhat basic and may have limited effectiveness. The design, in particular, seems a bit outdated or very common, and the site lacks interactive elements such as a login feature etc … or user interaction. This absence of interactive features might be a potential reason for rejection.
CodeCanyon typically looks for products that not only have a unique concept but also offer a modern and engaging user experience.
Enhancing the design aesthetics and adding interactive functionalities could greatly improve Tuneplus and increase its chances of acceptance.
This is my humble point of view & I hope these insights help, and I wish you the best in refining Tuneplus for a successful resubmission.