The code to get all non-expansion quests free forever is DDOFREEQUESTS and is good until Aug 31st. To use the code, log into your character, open the in game store and then click on the 'redeem code' box. Enter the code in the box that opens.
https://www.ddo.com/en/news/free-questing-coupon-and-vip-update-%E2%80%93-thank-you-standing-stone-games?fbclid=IwAR2HO1C9ySJQNszL3Vt5CU7QidmBojeyme119hi7OOYxTGRqxMCnhgAodUk
SWG (pre-cu) - AoC (pre-f2p) - PotBS (pre-boarder) - DDO - LotRO (pre-f2p) - STO (pre-f2p) - GnH (beta tester) - SWTOR - Neverwinter