Co-authorship depends on many factors, few of them are:

1. The authors who had worked with you together to achieve the results. Since this is your review paper, then co-authors may be them who had shared the knowledges to briefly summarize your written paper.
2. To get the proper feedback of any research work as well as mostly depends on the methods, results and discussions. So you need to find few researchers' paper which has a good overlap with your findings. Then you can ask the most focused/ experienced/ renowned researcher out of them to get some feedback.
3. To increase the standard of the paper, you can ask well known scientists/ researchers who can reorganize your paper.

Co-authorship depends on many factors, few of them are:

1. The authors who had worked with you together to achieve the results. Since this is your review paper, then co-authors may be them who had shared the knowledges to briefly summarize your findings to write the paper.
2. To get the proper feedback of any research work mostly depends on the methods, results and discussions. So you need to find few researchers' paper which has a good overlap with your findings. Then you can ask the most focused/ experienced/ renowned researcher out of them to get some feedback.
3. To increase the standard of the paper, you can ask well known scientists/ researchers who can reorganize your paper.