Thank you, Yamada .
If I'm right, each season starts with tons of players. It's been 50 days now since this season begun and players already left. Most people see launching a new season as the only solution possible having reached this state.
I've seen that when all players leave there is no more farming, so new players arrive to an evironment where old players are too strong and where they will never get to obtain decent gear. There is no reason to stay this way, so as new players come, they will be leaving right away. My proposal: Make it all (or most of it) free for everyone as soon as the population starts going down. In my opinion, that would slow down population decrease and it may be able to retain new and old players making a snowball effect. Population may still decrease, but instead of going zero, maybe it would freeze in some base amount of population.