If you want to grind the reddit thingy is helpful and preferably join a PF.
Also daily roulettes alone give good pace.
I personally do atm my second Nexus while doing the dungeons for the Zodiak Braves' Quests with a friend (even if I get drop fast I run dungeons a lot as we both try be as far). Made in 1 week half the Nexus already with some farms of primals/coil