An unexpected drop in Verbal score!!!

Sorry to know this.
I would suggest you to order an ESR for this attempt, which could help explain things. And experts too can review and tell their opinions once you post that here.

As for study approach, you are seeking advice for - I would suggest you to follow a slow but very steady plan covering things mentioned below.

Begin your Verbal preparation with SC, then study CR and then finally study RC.

First stage (Understanding concepts and building foundation) :
For SC : start with manhattan guide and then use SC Nirvana by Education Aisle. SC Nirvana is a wonderful book and teach you to unfold the layers of GMAT SC problems. Practice no more than 15 questions for the category you studied(10 easy + 5 medium questions) . Also, I would suggest to study only one SC category per day.
For CR: Begin with CR aristostle grail then read CR power score bible. Practice not more than 20 LSAT questions per day; 10 EASY (Sub-600 level) and 5 Medium (600-700 level) questions for each CR category viz; Inference, Assumption, Strengthen etc,


Second stage - test and solidify foundations:
Practice 15 SC questions per day(10 Medium+ 5 Hard questions) from sources other than OG. (you can do that very much on this forum - GMATclub). Analyze both your wrong and correct answers.
Then start CR: Study no more than 15 LSAT CR questions per day (10 Medium+ 5 Hard questions) from all CR subtypes . Analyze both your wrong and correct answers.
Then start studying RC : Use GMAT Aristotle RC Grail book and practice 4 OG passages per day(2 Easy+2 Medium )

Final stage -Official questions only - Practice with real opponents:
Study from a mix of all SC question types and all difficulty level (10 questions)
Study from a mix of all CR question types and all difficulty level (10 questions)
Study from a mix of all RC question types and all difficulty level (4 passages)

Focus on accuracy than timing.


(In the Warzone/battle preparations)
Once you are done with all the above and feel prepared only then you should book the exam.
And meanwhile keep practicing the exam techniques (practice with CAT) to built stamina and conquer anxiety/stress etc.

hope this helps.
Press Kudos, if you find this helpful in any way.

Wish you good luck for your next attempt.