There’s a lot of #content in the new expansion. It’s mostly locked behind a variety of gates, some of which players can’t even control. Warfronts are the best example. You might assume joining a Warfront is a simple matter of opening the group finder. Wrong! Warfronts are only accessible for a week at a time. It’s not precisely clear how often that week will come around (it’s based both on a time gate and on the opposing faction gathering resources) but, as of right now, it looks likely to be available just one week out of every four.
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But every new character made that wants to craft old expansion stuff will have to level using expansion specific materials. Stocking up on profession materials that are already high in demand can be a great idea. This will primarily be materials used to craft the various mounts. Ghost Iron, Trillium, Living Steel, Pyrium etc. are all great candidates to stock up on.
Set sail for the previously unmapped isles of Azeroth. Battle in groups of three as you race against cunning rival intruders—or enemy players—to collect the island’s resources. Constantly evolving challenges await as you traverse frozen landscapes near Northrend, open the gates of an abandoned Gilnean castle, navigate a war between elementals and more. Tides of Vengeance adds two new Island Expeditions to the mix and two new random events, as well as updated rewards.
Any decently geared 90 can complete a Pit of Saron trash mob run in 3-5 minutes. Each mob in the heroic version has a chance of dropping a Battered Hilt, which sell on the auction house for around 10k. Video guides will show the best route to take to pull all the trash mobs at once if you're a class with good AOE; other classes can simply pull less mobs at a time and loot as they go. While this method is a little less reliable than farming Vale-- after all, you're left to the mercy of RNG gods-- it has a higher chance of huge windfall because you could get a multiple hilts every run. Pull the mobs, burn 'em down, and cross your fingers when you loot. On top of the hilts, there's plenty of vendor trash, BoP epics for enchanters, and even a trinket that turns you into a gorilla. You will have to have completed the Forge of Souls in Icecrown Citadel to access this particular dungeon, though.
I would also like to point out, just because it gave me a giggle, that in one sentence you highlight that everyone is trying to make gold in BfA and then in another direct people back to the Engineering/JC mounts as a proposed solution. While I appreciate the suggestion, you seem smart enough to realize that those, too, are saturated markets. They have been for years now, so that's just moving from one camped market to another.
Don't get me wrong, I'm not turning my nose at people who struggle to do well (I'm not exactly a mastermind myself), but the legion expansion has made people lazy in terms of finding their jackpot system. We need to get used to gold making going from the "all for all" system to the current "all for one" system and the first step is understanding that the WoW economy is never decidedly made good or bad as if it somehow exists along the same lines as class design and gameplay mechanics.
Allied races aren’t much better. You can only earn them by grinding out reputation. It doesn’t take that long but casual players will need to invest a couple weeks primarily to it, and focusing on that grind will take you away from others, like earning gear. Each race has its own grind, but the things you do to work through it remain the same, adding to your boredom.