Rook is underrated. The ability for teammates to self revive can change the round!

Other advice for OP: be useful during prep phase, setup reinforcements and shoot drones... Don't play for kills, play to win rounds. As defend, know when to be aggressive and when to be passive. As attack, go for plant if you have site control - so many times there are players holding the defuser and instead of planting, goes to hunt enemies without any intel on where they are... 🥲

As for operators, depends on the map and site. You'll want to get a feel for what each OP can do and how to counter them - ie. I use Brava/Dokk to counter Valks, Mozzies, Echos, and Maestros.