need to bail out: how do I make usb to wipe everything? all paths seem defunct

iMac 11,2 running Monterey. Ive been trying to get this in more/less original condition to give away. Starting up with key commands so far does not work. I can make a usb stick to boot from, but i cannot d/l and make a High Sierra installer, because the apple checker says I can't download it [system is supposed to be pre-highsierra..]. fail. should I hire Linux distro, make install usb that would partition disk for dual boot? then wipe the original? or linux distro that would scorch earth and install itself?

submitted by /u/richardthe7th
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