Samsung phones have the Secure Folder which can have a different, more secure password and be encrypted when the phone is on.
I use the Cryptomator app for this, it works as advertised. I keep ~60 GiB of personal files in there that would be an easy button to steal my identity and savings. I'm just hoping it doesn't include an NSA back door.
Secure folder uses or is in the process of starting to use Android native feature private space, which is available on all Android 15 phones.