Very helpful write up, thanks! When you start the new season, what's the most efficient way to play and get some FG? :D In terms of since when you complete the campaign, you can go anywhere... do you just rush to helltides or what?
The key thing to what I've noticed is you have level up fast. That way, you'll have access to better gear (possibly ancestral) and you can fight the lair bosses to get the class specific uniques. And then, you want to offer pwr lvl services or lilith kills.
With the new expansion coming out, the fastest way to lvl is always doing the campaign. By the time you are done, you'll probably in in your lvl 40's or 50's. From there, you have two options:
(1) nmd with wisdom affix (these dungeons have exp bubbles that come out from mobs--gives massive exp)
(2) hell tides non-stop
I think once you can start doing like pit 30's, it's enough to do pwr leveling to 70. I think the price will jump b/c it's no longer 1-60, but 1-70.
Some people made bank by finding the Prankster nmd sigils (guaranteed 1 mythic + spark + 3 legendary runes) and others made a lot by selling Treasure Breach nmd's (you get a ton of legendaries + obucites).
There were some seasons where it was mostly made with items, some seasons with boss carries, some with selling pwr lvling, so I think we'll have to do what the demand is. My guess is that everybody will want Warlock gear.
Some people get really creative with this stuff, so it's exciting to see how people will make fg this next expansion.
Good luck!