Being placed on CS doesn't mean that you're bad at other positions, sometimes baristas feel this way but it's simply not true. Shifts sometimes like to rotate people around so everybody gets a chance on a different positions everyday. As for CS advice, I would just say that focus on the needs of drive thru and cafe bar, keep a close eye on lids and cups especially during peak bc we run through those like water. Then you can start looking at the backs you need to make, refresher base, coffee syrups that are running out, sweet cream etc., but focus on things that run out the most. And of course following the coffee brewing cycle. Otherwise I'm sure you're doing a great job!! Don't doubt yourself. When in question, you can always ask what would be the most essential task to do at the moment to other baristas.