How to actually fix your mistakes (no shortcuts allowed)

You can't just "learn from mistakes" without a system. First, you log the exact grammar rule you broke in a physical notebook. Second, you quarantine that grammar point for exactly three days of dry drills. Third, you ban yourself from anime or any "fun" immersion until you pass a mock test on it. If you're skipping these steps and just using apps, you're building a foundation of sand. Do it right.