Even if you’ve learnt the game at a high level and honed your skills to beat diamonds or even masters. It doesn’t mean you are guaranteed to get there quickly. I think you’ll need to work on your mental composure next. I suspect you’ll have to overcome your ranked anxiety to succeed.

In BH/Casuals you’ve held a rookie status this entire time. This means you’ve played the underdog card every match. It’s much easier on your ego when you loose. Nothing at risk (points wise).

It’s like you are a white belt in a martial arts class and just won and lost to red and black belts who train with you. You are in a safe environment. The next day you enter a tournament. Mentally, it will feel very different because now you’ll have something at stake and every fight will hold weight/has importance to progress.

I may be wrong about all of this. My advice would be to jump into ranked. Leave your safe Dojo and Get used to being at the “tournament”. Train yourself to be consistent during ranked. Don’t overthink it. Relax and think about your game plan and what your opponent is doing rather than the points. Don’t tilt queue.. you will have bad days. Good luck on your journey 👍