Hi @Borbala_Eke,
Unfortunately, the answer to all three questions is the same: Device Sync as a service will be switched off after September 30th. Realm SDKs as a local database will still be available as open source, but versions 20.x and later won’t be supporting a synchronisation in the cloud.
If you’ve a plan to migrate that you can share with us, and need some more time, you can open a Support case, and ask for an extension: 3 or 6 months are typical.