Why is the plight of the Ukrainian people seeming more important than that of the Kurds, Palestinians or Yemeni people?

A few reasons. One is that Ukraine is in the western sphere of influence now. Even though we were aligned with the Kurds, before Trump dicked them over, they were never really part of the West.
Another thing is that we already had a bad relationship with Russia, so the media is comfortable calling them out. Whereas with the Palestinians, obviously the media isn't going to call out Israel for their war crimes.