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For example, one could consider adding a third disk (dev/sdc) additional disks to the NMIS VM and moving the /home directory and|or any other directory consuming huge disk space to its own mountpoint on this third disk the additional disks as an alternative to growing partitions on disk 1 (/dev/sda).
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Since disk 1 (/dev/sda) has more than 1 partition, GParted is probably a useful tool for this jobtask:
https://gparted.org/display-doc.php%3Fname%3Dmoving-space-between-partitions
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