Oh, also, the only thing I’d really get super hands on with would be Dragonlance.
No retcons, just a time jump just barely far enough that the world is essentially back where it was with the OG Trilogy. Solace’s great trees restored, rumors of Dragon Armies or something similar, few gods around, etc.
Not exactly the same, but full circle, just in time for a new great threat to the balance, and a need for new Heroes of The Lance.
One cool thing would be the idea of gaining epic artifacts at low level, and introducing rules for them to start at an Uncommon power level and get more powerful as the character untaps their potential.