Hey vorropohaiah, i think you really should give the CBG a try. If i remember correctly, they really are kind of a sister site and we had some forum-crossover work in the past. At least it is a forum where the world building is very much in the foreground. Mapping is a subject discussed now and then but very much in the background.
Btw, is it possible that the reddit cartography is a private thing? I can't seem to find it as a r/cartography directlink.