Hi just a little suggestion,

For the Arena season period, make it the first 25 days where players can only click on Rank Battle and not both. In the current gameplay, both Rank Battle and Training Battle are active thus making the match-making for Rank Battle took much longer time to matchmake. But the daily Arena missions should be unavailable. They can resume after the current season ends on the 25th/26th day of the month and the Rank Battle option will be unavailable.