I agree with OP's suggestion of Playable Goblins and Aasimar, I'll also add Githzerai into the mix, both Githyanki and Githzerai are the same race but with different cultures, it's literally no different than having Real Drow (Lolth Sworn Drow) and Surface Loving Traitors and Heretics (Seldarine Drow)
I really want the artificer class and companions that fits with the class, I really love Barcus Wroot and Dammon would also be a really good option!
Artificer should be part of an Eberron DLC, along with Shifters
https://forgottenrealms.fandom.com/wiki/Shifter, Changelings (Like Orin)
https://forgottenrealms.fandom.com/wiki/Changeling, Kalashtars
https://eberron.fandom.com/wiki/Kalashtar and Warforged
https://forgottenrealms.fandom.com/wiki/Warforged,
I suggest a Helia DLC, no point in wasting a perfectly cool concept like that,
If there's a Menzoberranzan DLC, I expect Lolth Drow, Driders, Szarkai (Albino Lolth Drow)
https://forgottenrealms.fandom.com/wiki/Szarkai and Draegloth (Drow Tieflings)
https://forgottenrealms.fandom.com/wiki/Draegloth