You have a gold maybe diamond level deck (if that) I dont understand the issue?
People with bronze level cards were playing into diamond this is exactly the fix.
Also now that low powered bots won't be in diamond you wouldn't make it into champion anyway it just isn't feasible sot here will be a leader board for people with collections similar to yours
Before I started selling the cards (after reading the update above) I had enough maxedout cards in my deck to win battles against other maxedout players on regular.
So if that's a gold maybe diamond level (if that) deck I don't know what to tell you.