Neptune in the 10th House denotes an artistic/Spiritual/Political/Deceptive career. Neptune is the Planet of creativity, dreams, confusion, illusions, deception, drugs, healing, spirituality, photography/film/media, even politicians who 'put on a show' tend to have this placement.
I have mine in 10th, Ruler of my Asc (Pisces) tightly Conj MC. I am a psychiatrist, hallmark feature of one (Mental issues). Lots of people told me I might end up in media, so far I haven't been approached but might not be surprised.
On the other hand, it comes with Confusion. I've struggled with Career decision quite a lot. It's here on AW as well, I'd been trying to get into Surgery for years before a Wave took me out of it altogether. Neptune in 10th denotes maternal influence unconsciously & her desires to succeed publicly & if they are not in coordination with the individual's personal needs, they can land up with massive ups & downs in their professional lives.
Good luck finding out the meaning of yours. Do come back & share it.