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 and store encrypted data during transmission. The motto here is: Collect now and decrypt later.