You’ve done the first thing i would have replaced that’s the oil pick up pipe.
Second is the sensor if those are new and it still comes up oil pressure im assuming the oil is correct spec is can only be a oil pump issue I don’t really know much about these tdi engines but if They have a balance shaft style of pump like the 2.0fsi it maybe at fault or potentially about to cause you big trouble. It’s really hard to say without personally looking into it mate.