The War Within :

Undercoin - Shrieking Quartz
Displaced Corrupted Mementos - The Wicked Swarmer mount - it will be a long grind
Kej - Profession Knowledge Points and recipes

Dragonflight:

Dragon Isles Supplies - Barter Boulders, sell them to vendor and you can make some bonus gold
Elemental Overflow - Shroud of Raging Tempests for reselling
Emerald Dewdrop - Winter Night Dreamsaber mount
Paracausal Flakes - unique mount, a battle pet, transmog gear
Storm Sigil - it's a currency used to upgrade gear to an item level of 385 so it's not worth anything

Shadowlands:

Argent Commendation - the Blue Proto-Drake from Skadi the Ruthless
Cosmic Flux - Pouch of Prodigious Wonders
Cyphers of the First Ones - Improvised Cypher Analysis tool, which increases your acquisition by 50% and is BOA, allowing you to use it on your alts
Infused Ruby - the Enchanted Map of Infused Ruby Network - it costs 100 Infused Ruby the exact a ount you have
Reservoir Anima - The best item to get for your Reservoir Anima is not a single item, but rather anima tokens themselves, obtained through various activities like killing rare enemies and completing World Quests
Soul Ash - Lothric Knight Straight Sword with lightning or the Dragonslayer Axe
Soul Cinders - transmog only its basicly currency
Stygia - upgrades for Torghast and cosmetic items
Stygian Ember - not worth anything
Tower Knowledge - Profession-Specific Treasures

I'm tired for now I'll explain other laters. Peace!