Sometimes in life, balance is the most important thing. I could think of a few balance changes that I would implement into the game right away. By that, I don't mean disturbing the flow and the investment ideas, but making balance a real thing and creating a fair play experience.

• drastically lower the costs for the creation of smaller tournaments
• add starter boosts (more dec and special events) for real newbies
• restrict card levels in ladder games intelligent from game to game
• ban all none default summoner below diamond league
• implement training mode with matchmaking
• offer a second starterpack that is actually competitive
• offer incentives for daily activities
• give players the ability to decline ladder progression
• maybe make boosters 100€ each and put only 2 cards in, that would be great!

These things would already erase so many hurdles!