Samsung Galaxy Note 5 Battery Issues after update to Nougat

Before update, battery was absolutely fine. After the update which was about 4 months ago, battery standby has decreased drastically and its too annoying. I noticed this "Phone Idle" is eating up a lot of battery; almost similar to "Screen" usage. I think it is the culprit. I have also used plenty of methods present online to rectify the issue like Hard Reset, Cleaning Cache, Resetting App preferences, making wifi to restrict in background etc but nothing has worked so far. I would really appreciate if anyone could help me because I don't wana change my cell phone.

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