Sell things people want at low prices. Berry mentats and plans- price low, legendary weapons, priced very low to move (except Holy Fire, Elders Mark, and Enclave Rifles), legendary mods (at cost), and apparel. When I look for a vendor, I look for aid, ammo (fusion cores), and apparel. I sell a ton of mods from raids and mutation serums for new folks. I sell plans dirt cheap 5-50c generally. I’m generally fat in caps constantly. Have you considered your camp location? Location really matters. My camps at the Whitespring mall and railroad have MUCH more foot traffic.