Last night I was just over Bronze 90 and trying to figure out how to get that 99 overall pack at Silver 1.
Don’t neglect your Live Series collection. You don’t even need the full teams. I spent about 2 hours just putting in minimal bids on every Bronze and common players who was on a team. Due to the dead market, you can get most Bronzes for about 28 and commons for 6-8. I had 95% of my orders filled almost immediately, and then went into the Live Series and just locked in the lowest-rated (or any No Sell) cards, and easily collected 20 for most teams. That alone gets you 400 stubs back, plus 4,500 XP. And a few teams like the Orioles and Tigers are cheap to finish. I hit Silver 1 before going to bed and wound up making a few thousand stubs since all the buys were cheap (and you can also quicksell them after if you want).