Hi and welcome!
Basically, the areas that IMO need most help are (by order of importance): compiling it and generating a dmg file that mac users can use (for 0.92.3 if possible, and ideally automatically/ondemand for the development (git) version [maybe using CPack if it's possible]); documenting the process so that other people could do it in the future; and by trying to figure out the gtk-mac-integration stuff (that i supposed to make things look more native, iiuc) or the gtk-mac bundler(that is supposed to bundle X without xquartz, iiuc)
We currently have some process setup for CI on mac with brew on https://gitlab.com/inkscape/inkscape/blob/master/.gitlab-ci.yml#L35 and if you have any questions that are not mac-specific I would be happy to help, here or on IRC :)