I will show you what to look for and how to fix the issues listed below.
Reasons you can be losing keywords:
2.outdated Content Need To Refresh?
Change In Trend Of Keyword?
Backlink / Anchor Changes?
Who is your New Comp?
Change In Googles SERP ( Like The Maps Pushed Down Page!
Google Rewarding Different Intent?
Fighting yourself?
Things you can do to fix your keyword loss:
1a. Stop Fighting Yourself check pages ranking for same keywords
2a. Reoptimize Your Pages add words or take away words