Increase your attendance. If you've been training 3x/week, push to 4x/week. The 90 days before a promotion is when consistency becomes most visible.
Refine your top 3 positions. Don't try to learn new techniques. Sharpen the 3 you already use. Make them sharper, faster, more reliable.
Roll with everyone. Don't avoid hard partners. Don't only roll with people you can dominate. Show your professor you can handle pressure from all belt levels.
Help white belts. Spend 5 minutes after class showing technique to newer students. Professors notice this — and it sharpens your own understanding.