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First, I would like to mention that I saw that there are similar questions about this topic on this site but this one is very specific whose answer I could not find anywhere. The query is as follows.
I had sent a manuscript to a springer electrical Journal, 10 months back. For 3 months, the status showed "With Editor". Then finally it changed to "Under Review". For the past seven months, it is "Under Review". One month back, I had sent a polite enquiry to a person in editorial office about my paper. He replied that he was sorry and he has contacted senior editor to speed up the process. Today, exactly one month has passed since his reply and the status still remains under review. The average time taken for the first decision as mentioned on the official journal website is 3.5 months. My fear is that the article has already taken nearly a year since I had send it and if there is any more delay, I would not be in a position to send it to any other journal because the proposed approach will become old by then. Shall I send another email to the editorial staff, given that I had already sent another email just a month before? What kind of email can be sent in such a situation ?