One of the best ways of honing your skills as an academic or professional writer is to serve as an anonymous peer reviewer for others’ manuscript submissions to journals.
If you are new to this, there are several online guides:
An online course in writing and reviewing for professional publications prepared by Patricia Gonce Morton, PhD, RN, FAAN
BMJ’s resources for reviewers
Peer review: the nuts and bolts
These resources have been recommended by members of the International Academy of Nurse Editors: https://nursingeditors.com/