Ask HN: Best way to reasonably secure cloud storage?

What are best-practices for securing cloud storage? If you want to be able to be the only one who can read/view your documents in an online cloud storage provider, how do you set this up? From what I understand, there are several options:

1. Roll your own (Nextcloud). 2. Use a closed-source cloud encryption drive (Boxcryptor) 3. Use an open-source cloud encryption drive (Cryptomator) 4. Use something like VeraCrypt

All of these have benefits an downsides. Cryptomator decrypts super slow in Windows 10, making it useless for storing video or pictures you want to access fairly quickly. Boxcryptor works well, but is closed source. VeraCrypt volumes have to be entirely re-synced when one change is made. Nextcloud has all the downsides of needing to self-host something.

What are suggested ways of keeping your files private in the cloud to a reasonable degree? ("Reasonable" because I'm aware there are many avenues that a state agency could take hardware-wise, or many methods that would be secure but make your files essentially unusable in the real world).