1) Removed units (with or without H scenes, I don't relly care) or english only replacement for those with same skills/stats.
2) Gold rushes! We are at point were there were already 2 in jpn and we are closing to 3rd yet we got none.
3) Change Trading Post more frequently! 6 months is just too long.
4) New story maps.
5) Sure way to get a princess. More and more maps require to have them, the only one that is somehow possible to get is Themis and she is just to weak to handle almost anything. Now even if I will spend it's just a pure lottery.
6) Revivals. They were already a thing on jpn server at that point.

What kind of events are best? Chalanging yet rewarding like Karma and Solano. Actually anything that isn't farm event is nice. Subjugation, star rush, gold rush, anything.