So I shot up to Silver 1 pretty quickly as well. Things are starting to get hard for me around the 1650 range now, so I think I might have hit the level of my card quality. I think the level caps in bronze were keeping me down, and once I got above them I was able to shoot up with some of my level 3 and 4 cards. Well now I have to work at things a bit more, but that should be fun.
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From @rantar