Easier Arena Play
The Arena takes way too much time to get the milestone rewards.
There should be auto fight in Arena before reaching all the milestones.
Aka. Once a player has reached all milestones, the Autoplay features are disabled.
This way, players can get the milestone rewards and the players who want to go for champion or high-rank rewards
can continue to play on their own.
But, FWIW, The milestone rewards should be easy to get for all players with a large pool.
Perhaps this can be open only for people who have cleared Uncollected or so.