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It is far from clear what you have connected, what OS, what code you are actually using or how you installed modules.
No module named 'serial' means the code won't compile because you haven't installed it.
Normally you would install with sudo apt install python3-serial.
Even if you fix the code it won't work as /dev/ttyAMA0 is connected to Bluetooth on most ...
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I see the partition is already resized, all you have to do is to run resize2fs /dev/mmcblk0p2 as root. This should be done on a mounted partition, unmounting / on a running system is a sure way to crash it.
If resize2fs fails to grow the partition even as root, it's typically because you have errors on it which need to be fixed with fsck. If this is the case,...
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