You can get r6 very quickly . I recently sat down and started slamming korthia and doing it right I went from r3.5 to 5 in 3 days so here’s what I got if anyone wants to add.
Sockets/conduits from codex is a massive amount of catalog I think it’s 100k + you can also get sockets from deaths advance (I was neglecting that and tunneling relics)
If you pull up on YouTube there’s some videos that show relic locations you want to knock all of those out asap it’s 500 rep per and there’s a bunch.
When reset happens grab all the quests and pull up a map so you loop grabbing all the treasures while you quest they start to diminish return so don’t bother staying to long to keep looting mushrooms for 2 greens.
When you turn in your quests if you did not get a rift repair key / teleport kit go to the codex turn in and buy 1 of each.
Pull up a map of the rift treasures and go grab all of those.
This takes me about 30 minutes now that I got a path down if you want to sweat further run around and kill rares- the teleport key is to get those ones when they pop.