Something despawns to restart the timers to respawn again.
Star metal ores cover a huge area and near the obelisk is just a humiliating small part of the spawn areas. There for if you wish to seek for these ores you better start your journey from the mount of the dead, take the path to Ymir religion giant and continue from the frozen peak ti walk to the frost keep. Look always on the sides of the mountain line, this area is always rewarding! Use hardened steel and higher tier tools, you cannot harvest star metal with low tier tools anymore.
And you must love despawns not hate them
. If we wont have despawns we won’t have respawns, so in order to find a named crafter you should travel the whole map and raid all the camps until you’ll get one. So despawns are good trust me 