Stego/Information Hiding is also a considered topic for our SI at Elsevier FGCS (impact factor 4,6x!), cf. https://www.journals.elsevier.com/future-generation-computer-systems/call-for-papers/emerging-topics-in-defending-networked-systems
In case you would focus on information hiding in smart systems, this SS of IEEE TII could also be of interest to you (impact factor 5,4x) https://steffen-wendzel.blogspot.com/2018/12/cfp-ieee-trans-industrial-informatics.html
I have submitted in special issues of steganography in sci journals of Wiley, IET, Elsevier etc. You can find something from this link.Article Application of Lah transform for security and privacy of dat...