You could indeed pick from a range of options of conflicts where people have raised concerns about genocide. Sadly, it's not as uncommon as people would like to think.
It seems to me that the criteria for genocide as outlined in the Geneva convention can be met in most wars.
Yet, genocide is something very specific - the Holocaust, Cambodia, Rwanda etc. It was never intended to describe the horrendous cost of war, especially of modern warfare, in densely populated and built up areas that couldn’t have been envisioned at the time of its creation.
And I am very wary of the concerted effort and campaign here to accuse Israel of genocide when:
(1) no such effort and campaign has been undertaken in similar recent and worse conflicts.
(2) Jewish people have always been the target of such campaigns to portray them as uniquely bad, sinister and evil, since the beginning of time.
(3) they themselves have been victims of a genocide that was carried on an industrial scale and for whom the sentiment has never went away.
I say this whilst acknowledging the suffering of the people of Gaza, their insurmountable loss and horrendous death toll.
ICC action was hampered by several obstacles, including the US, Russia, Syria not being a signatory/member, etc.
Russia and Israel are not signatory members, yet it did not stop the ICC issuing arrest warrants for Putin and Netanyahu.