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In addition to other suggestions, the cards need to show what they’re alternative to without clicking.

ZFS dedup is memory constrained, and the memory use scales with the block hashes.

If performance isn’t a concern, you’re better off compressing your media. You’ll get similar storage efficiency with less crash consistency risk.

Check your sector boundaries. You can’t resize a physical partition if it overlaps another one. That lvm shrink likely lowered the top sector, rather than raising the bottom.

Also, 488mb should be plenty in /boot. You can purge old kernels with ‘sudo apt --purge autoremove’ (that’ll take any other unused packages with it, so use caution.)