I went straight to Fallen God first, then i started spreading caphras around to the other pieces. No idea if that's the suggested/preferred method though so take that with a grain of salt.
Ronaros were so annoying, and they are such trolls too. You will get a bazillion of those worthless little rings and every time your character will cheer and jump and for a split second every time, you're going to think you got the potion piece, but nope, shitty ring or marni box. Every time I went to grind on them i broke it down into 1 hour chunks and as long as I got at least two pity pieces in that hour, I didnt feel as if it were wasted. During that hour though I got a ton of trash loot, rings, doom horse mats, etc and make serious bank.
Since finishing the potion I have moved into Hystria. For some reason I want that permanent compass. I already have the Aakman part, which is the easy one, and in my free time Ive been killing for an hour or so on my Nova or collecting knowledge on an alt when I need a break. Got my first Disto bought and even ran a second Blackstar weapon up to Duo Godr and have been using it/trying to sell it to fund my second Disto.