in 1 reset, you can do the following: heroic spam during downtime (nothing to group for), wqs for a few pieces MAYBE, ALL mythic0+s, if you get lucky you can do a m+ key or two (your own, invite higher geared players obviously), ALL LFRS, n/hc EN, n/hc ToV - get lucky enough in these things prior you can do a NH N run, then theres the random dauntless drop that CAN titanforge, Sentinax farming and nethershard turning for 880+ item.
im not saying this is easy or not time consuming, but its possible and you dont need titanforge on literally every piece.
doing this during emissary of war week is a big bonus. i got 875 in 10 hours without doing nearly half of this last reset.