Nexus9300v.9.3.9.qcow2 -

install all nxos bootflash:nxos.9.3.10.bin

Always execute copy running-config startup-config and wait for the CLI to return completely before shutting down nodes or saving lab states in GNS3/EVE-NG. Halting the virtual machine abruptly can corrupt the virtual NVRAM file system, forcing a clean reinstall of that specific node. nexus9300v.9.3.9.qcow2

license grace-period

If you need to interrupt the boot process for password recovery or to change the boot image, use Ctrl-C when you see the "Loading Boot Loader" message. install all nxos bootflash:nxos

I notice you've shared a filename: nexus9300v.9.3.9.qcow2 nexus9300v.9.3.9.qcow2

Convert the .qcow2 to a backing-file setup (for faster cloning):