The original poster probably won't get this. But this info might be useful for other people.
The most accessible shaman culture, in my view, is Korea. Most older Korean people know about mudang (Korean shamans) and know people who visit mudang. If you have close Korean friends, they might be able to help you find a mudang. Some mudang advertise on the internet. All mudang work for money. However, I don't think mudang usually do journeys for soul retrievals, although they probably know rituals for calling back souls and related purposes.
Actually, many shaman cultures are not big on journeying, although they generally have rituals for calling back souls. If you have Thai friends or Cambodian friends, they might be able to help you find a traditional healer. If you have Chinese friends, they might be able to find you a Daoist priest. Daoist priests have rituals for calling back souls. Even if you don't have Chinese friends, you can go to temples in Chinatown. If they have mediums in the temple, they might be able to help you.
As with Korean shamans, spiritual workers in Asian countries generally work for money. Some advertise. It's important to be discerning. As with all occupations, some spiritual workers are good, and others are bad. You can also look up Daoist websites on the internet and inquire through email.
The original post did not mention demons. However, the replies indicate that demons are a problem. You don't have to find a shaman to exorcise demons. Most Asian cultures have exorcists. Again, I recommend Daoist priests. You can also contact your local Fengshui practitioner, because authentic Chinese Fengshui practitioners often have connections with Daoist spiritual workers. Tibetan Buddhist teachers generally also know about exorcism or about people who know about exorcism.
I mentioned mainly Asian practitioners, because other traditions are beyond my field of knowledge. Maybe other people have stuff to add?
It's important also to know that almost everyone is missing soul pieces. It is possible to live a fulfilling life even while missing certain soul pieces. Therefore, people who feel that they absolutely need a soul retrieval should first relax. Take a deep breath. When you search for a spiritual practitioner, take your time. Conduct the search systematically and be discerning.