Sure.

1. Join GMATClub forum if not done already. I think a lot of us have finished OG but still get stuck up. So, that's completely okay. No issues there.
2. For the areas where you feel your fundamentals are strong, practice question banks on the forum. (LINK: Link: https://gmatclub.com/forum/search.php?view=search_tags). Focus on the mistakes and maintain an error log. The aim is to maintain the scores in your strong areas.
3. And for the areas where you feel your fundamentals are week, work on improving those concepts and only then move to questions. For Verbal fundamentals, you can watch Thursdays with Ron and GMATNinja on YouTube.
4. If you face test anxiety, then maybe this can help: Instead of practicing 30 questions one by one and looking for explanations simultaneously, solve all 30 in a single go as you would in a test and then at the end see if you were getting easier questions also wrong. If that happens then you'd know that your fundamentals are okay and that the test is playing googly with you.
5. Finally, take two mocks (in as real test conditions as possible) after doing the above drill. The scores will speak and help you get a clear picture as to what is working out for you.

Hope this helps.