İncreasing Nixos Security

I need to get password for Grub and i would like to get FDE alternatives to increase my security. İ cant format now too much data. So looking for FDE alternatives. What should i do?

What is your thread model?

Do you have to fear that some one takes your computer or harddisk physically away from you to read the data from it?

Or are you just concerned about online/runtime attacks?

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Both but more likely physically away from me