Cool, Ta.
...so you have heaps of space available.
I will deal more with this on my tomorrow, but in the meantime, you could take a read of my Thread here
https://linux.org/threads/how-to-in...t-need-for-a-usb-dvd-sd-wizards-corner.56273/
which provides a way for you to test lightweight distros (Debian-Ubuntu-Mint-based) with a view to installing for your Zoom meetings, without the need for a USB stick or other removable media.
You could install the thread's subject package straight onto your current LM 22.1 install, and then start as soon as you download an iso.
Be aware that before you can
install another distro, you
will need to use GParted from an external source such as a Linux Mint Live stick, or GParted Live stick, to carve back some space from your current setup, for a second distro to go onto. You cannot do that from your GParted currently installed, as it stands (safety feature).
Once a second distro is installed, the world is your oyster, as you can use the GParted from one to manipulate the other, and all unallocated space.
I would also suggest taking a look at
https://en.wikipedia.org/wiki/Light-weight_Linux_distribution
for ideas, last updated 24th March, and maybe
https://www.techradar.com/news/best-lightweight-linux-distro
and focus on the ones that are Debian-based (use distrowatch.com to check if you are not sure)
Questions on grml-rescueboot I can field over at my thread.
Cheers
Wiz