Welcome and sorry to hear about your previous result. With CISSP, as the questions in the exam are not B&W same applies to various perspectives and advises. I also passed my CCSP (May 2019) and CISSP (Dec 2019) in the first attempt. In terms of preparation I used Boson tests (only once) and never cared what % I was getting. Did ISC2 Prac test (only once) in one go and again never cared about the scores. I used Shon Harris 8th edition, Official CBK (pretty much use less) and Sybex official study guide. Nothing else. If you keep on doing practise tests then I suspect you will train your brain to a point that it will start to look for obvious choices and do lesser thinking. I felt that myself. 11th hour is a summarised book so you summarised a summarised book. I don't know how much time you have but I swear by Shon Harris, if someone wants to make notes, Shon Harris is a very good choice and so is Sybex Official guide.
Unlike other exams CISSP basically tests your capability to apply the knowledge in the field. If you are able to see the use cases which you didn't notice before, that means you are getting the concepts. An example can be the assessment of the Information Security Management Policy Framework which involves Policies, Standards, Procedures, Guidelines etc and regulatory/compliance requirements of your organisation.
Other example can be to look for data protection standards and see what ciphers are being used, are they relevant and in commensuration of the value of the data, key management etc.
My subjective assessment is CISSP is all about applying the knowledge and select the best approach under given circumstances.
Good luck for the next try mate
Study the book! That's basically it. I constantly used the official CISSP study and test apps on my phone to check the level of my knowledge and watched Kelly Handerhan explain it to me on Cybrary videos.
The questions on the exam are way different than anything you can practice online. Anyway, I'm positive that if you put enough effort in it that you can pass.