trying to complete sundered doctrine as a solo player is torture

contest mode is technically impossible for a solo player, and since raid and dungeon exotics are 5% drop rates, it feels like mental torture everytime I try to step into that dungeon, every encounter is miserable, half of the teammates in group finder leave after the first 2 minutes, and trying to do it alone made me lose a piece of myself, for 6 hours I went on and on, and it feels like I've gotten nowhere.