In general, you should consider whether you need the relevant cloud services at all. For example, you can use apps such as "OpenKeychain" to encrypt files before uploading them to a cloud. If you use an Apple device with your iCloud, activate extended data protection there. In general, you should store sensitive and critical data locally. For example, on an encrypted hard disk.
It can be assumed that secret services and other state actors also intercept encrypted data during transmission and store it in order to decrypt it at some point in the future.