Trzy rangi na jednym koncie
Overwatch stores a separate competitive division for tank, damage and support, and it is common to sit several divisions apart between them. A player who calls themselves Diamond usually means one role. That is why an order in Overwatch boosting names the role first, and why a climb on one role leaves the others exactly where they were.
The practical decision is which role to invest in. Moving your strongest role costs less than moving your weakest, but the weakest is where the biggest improvement is available. A Overwatch coaching session is the cheaper experiment, because a coach can tell you which of the three is closest to a breakthrough before you pay for a climb.
If several roles are behind at once, a listing from Overwatch accounts can be a shorter route than three separate climbs. All of it runs on the escrow flow set out in the Eloboost24 buying guide.
If you want to keep your own account in your hands, Overwatch Fast Games books a verified player per match who queues in your group and plays the role you need, while every game stays on your record.