If I were trying to find someone at the volcano here are a few places I would look:
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The “ant hill” - it’s on the eastern front side of the volcano. You can probably google or YouTube it in relation to Conan Exiles for exact directions, it’s fairly common.
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What I call “high rock” - to the western front side of the volcano there is an area where you pass under an archway of stone after crossing lava veins. You can build at the top of this archway VERY high in elevation.
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Check under structures in the volcano, especially structures over lava. You can build some pretty cheeky roof bases under bridges and structures in the volcano.
As @Selene01 suggested trying to place a foundation can be helpful in finding bases, think of it as your metal detector. Sorry if this doesn’t translates well for you, good luck exile!