as i just saw the thread with the series "The Stress Test Open" a new idea came into my mind..
We are currently in stress test.. resets are around the corner and grinding/playing feels a bit unrewarding to be honest (as we have to start it all over again)
So here is my suggestion:
Start a series like "The Stress Test Open" on a weekly basis. Offer EVERY player some reward for a successful participation. Not just the best 3-4 players as they are probably always the same and might already have tons of cards.
Treat it like an additional daily quest and reward