It’s rotting. You need to chop above the rot, let the cut callous, then try to root it.
It probably rotted because your soil holds onto water for too long, try adding something inorganic into like perlite, pumice, or gravel. Also those weeds in the pot make it extra humid
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That’s not a cactus
Ask over at r/succulents or r/euphorbiaceae
not a cactus and also its rotten
It’s rotting. You need to chop above the rot, let the cut callous, then try to root it.
It probably rotted because your soil holds onto water for too long, try adding something inorganic into like perlite, pumice, or gravel. Also those weeds in the pot make it extra humid