BFA or Shadowlands Tailoring for 30/32 slot bags if not done the Garrison Tailoring Bag grind are viable options as well as for nets/and disenchanting/scraping.
I am finding Alchemy past the Classic (1) for the Flask is useful for getting extra battle pets or mats or potions to fill in spots that racial ability or class doesn't provide as well as transmute. The key is you need herbalism until you unlock all the Legion/BFA/Northend/Mists/Outland transmutes - the BFA/Legion can use then use cloth, meat, and other mats to do most transmutes without herbs. Northend Alchemy (25) for the endless mana/health potions + the Siren's Alchemist Stone using a relic to make it ilvl 19 equipped has a nice primary stat proc.
Yes, most vet with an active sub can use the mailbox/AH to fill in if not soul-bounded by the enchant or such per se.
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Currently unlocked but for the first few days locked behind level 48. The vendor recipes for certain items still require reputation and level 48 which a F2P cannot currently obtain. As well as in other topics, most of the BFA/Shadowlands stat enchants are weak with DF scaling. I have yet to test the Shadowlnads "safe fall" on boots and "hearthstone" ones on wrist to see if those even work.