Usually happens when content becomes stale. Normal people drift away until something new happens and all that is left is the toxic addicts looking for 30 minute Raid speed runs disgruntled by playing the same thing over again or PvP players disgruntled about the current state of the game when there are many alternatives out there from MW remastered, Battlefield 1, Titanfall and Overwatch etc. Wait until the next significant content update or game, forums are very informative rather than the toxic mess it is now.