Part of Reigen’s bit as a ‘psychic’ is that he finds people with problems that they have attributed to Cursed Spirits, such as, lack of sleep, stiff shoulders, etc. and solves them with conventional means.
Only calling on Mob, or Serizawa when a spirit is actually the problem.
This is similar to how witches work in the Discworld series, only they can actually use magic.
Witches like Granny Weatherwax avoid using magic as much as possible, mostly using headology (psychology), Boffo (basically kayfabe) and their skills, only resorting to magic when absolutely necessary.
Now that I think about it Reigen uses a lot of Boffo in his work too.