1. Understand the reasons for rejection: First, you need to understand why your paper was rejected. This is usually given in the reviewer's comments or the editor's feedback. Understanding these reasons is the key to revise the paper and resubmit it.

2. Revise the paper: according to the feedback from the reviewers and the suggestions of the editors, make necessary revisions to the paper. This may include improving research methods, adding new data and expressing your views more clearly.

3. resubmit: you can resubmit the paper after making enough changes. Make sure that you have formatted your paper according to the requirements of the journal and included all necessary attachments when submitting it.

4. Communicate with the editor: Before submitting a new manuscript, you can try to contact the editor to explain your understanding of the feedback from the reviewers and the changes you have made. This may let the editor see your enthusiasm and efforts for the paper.

5. Patience: After submitting a new manuscript, you need to wait patiently for feedback from reviewers. If the reviewers are satisfied with your revision, they may accept your paper. If they still refuse, you may need to further revise your paper or consider submitting it to another journal.

6. Keep learning and improving: Being rejected doesn't mean that your research is worthless. On the contrary, it is an opportunity to learn and improve. Learn from this experience and improve your research methods and writing skills in order to get better results in future research.