How would you guys feel if the last tier (lvl.35) in the mission pass was the Material Storage?
Would you be more inclined to spend star gems (even buy a premium pass/mission pass) if you knew that you could earn a pass valued at 300SG? Perhaps you find that after earning that material storage you start getting into harvesting which is aided by using SG for recharging energy? Perhaps instead of people never paying for you material storage, they are now buying your mission pass and premium because they know that they can earn it eventually and enjoy your game to it's fullest and be more inclined to spend on cosmetics.
Sega/Microsoft, I know you guys must have a low CPI because you hardly do any marketing so put those resources towards aggressive retention while the iron is hot. I feel like considering these options can help ARPDAU which would be a shame letting your conservative UA and organic installs go to waste, but you guys already know that