I've been involved with Titanic historical research for more than 40 years. At this point, nearly everything is net-accessible, as are the experts doing the work. Steerage passengers are notoriously hard to trace. Post your info requests _everywhere_...cast a wide net!
Unfortunately, essentially all people who had direct association or contact with Titanic are gone. She is beyond the range of human memory. She has become a song, like Lady Franklin's Lament.