joy0412, long time no see
Great to know about you are going to have a trip again
Some information can share with you for refernce
Policy introduction for operating DJI in EU
https://www.dji.com/hk/mobile/flyingtips/de
https://info.taiwantrade.com/biznews/2021年欧盟无人机新规-2373580.html
Useful Drone map app in EU
https://apps.apple.com/hk/app/droniq-app/id1541813194?l=en
App information
https://droniq.de/pages/droniq-app?lang=en
You can register your DJI, plan flights and validate them against the new drone EU regulation came into force from the end of 2020. A lot of information can be shown in the map view such as area may not be overflown or may only be overflown with some restrictions.
Hope all these information can help