I guess you need to reinstall.. Not only delete and restart, but also reinstall from App Store..
In my experiment and experience, I always able to open CS after reinstall..
The condition when I open CS for the first time : building and decoration images still load..
Use that condition to store unnecessary decoration, unnused timed buildings, and unnused timed items..
For example: I store tavern, libraries, windmills, watchtowers, lantern spires, chateau, cathedral, theater, royal manor, observatory, amphitheater, cottages, market place, farmhouses, troves, mushrooms, flowers, etc...
After that huge storing, I able to open CS normally..
If you still unable to open CS normally, you need to store more..