To accelerate your improvement in Jiu Jitsu, you can take several actions:
Study outside of class by watching instructional videos and following high-level grapplers on social media.
Challenge yourself by participating in competitions to test your skills under intense conditions and learn from your mistakes.
Roll with intention by focusing on specific techniques for a week or two, which enhances your mental attention and muscle memory.
Be consistent in your training, as more mat time leads to faster improvement.