General GMAT Questions and Strategies | Continuously prepping but scores keep dropping (700, 650, 620, 600)

I am absolutely shattered today after receiving the scores for my 4th attempt this year for the GMAT. I feel completely lost and I don't know what I should do next, considering that it'll be my final attempt for the year if I retake it yet again.

Breakdown of my attempts

Attempt 1 (15/5/2019)
- Full-time studying for 1.5 months
- Prep used: OG, GMAT Prep (1-6), Economist
- GMAT Prep scores: 650-670
- Score: 700 (Q44, V42)
- Reflection:
- Overall: I managed to finish both quant and verbal on
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