From my understanding of the reviewers' comments, it means our proposed solution adds nothing new to the body of knowledge even if we get better results than the state-of-the-art work.
The reviewers believe our work is just an application of existing literature. While many published works do integration + per-existence method to enhance the result, we use pre-processing + per-existence method to do the same. We were rejected, while others were accepted.
Any advice is appreciated.