Hampton Navigation, Group

I’m in the process of preparing my manuscript for submission, and while I’ve double-checked it several times, I still worry about small errors slipping through. Some researchers recommend using academic journal proofreading services to refine grammar, clarity, and formatting. Others believe careful self-editing and peer review should be enough. Do these services really improve publication chances, or are they just an extra cost? Has anyone here tried them and noticed a clear difference in their submission outcomes?