Hm while "In the land of invented languages" was a fun read, I found the book to be overly Western natlang focused (I know many more natlangs than I do conlangs, but a lot of my natlangs come from different language families, so I am aware of the large conceptual gap between languages).

As far as keeping abreast conlangs, there's reddit's r/conlangs that's a lot of fun. Lojban and Toki Pona are very popular there.