Originally Posted by
Nerovar
On topic:
I'd probably conduct a few surveys about current WoW, WoW classic and maybe include some other questions (what were your favourite expansions and features) to find out where the biggest overlap is and how you can get people to be invested in the game in the long term again.
On a purely personal level, I'd start with a soft reboot of the setting (maybe another old world revamp with a "dark ages" theme of fallen civilizations, decaying infrastructure, declining cultures and technology, migration etc.) in order to bring things to a more down-to-earth scope when it comes to characters and the overall stories that are being told. I think people are getting really saturated with big screen world ending threats. I'd also reduce the amount of bloated, unnecessary systems that currently plague the game and return it to a previous state (Artifacts/Azerite and other weird power progression systems can go out the window so we can go back to a focus on regular items (maybe set boni), talents and glyphs).
I'd think about returning the relic and ranged weapon slot (maybe change it up a little e.g. allow warriors to have a shield in the relic slot instead of ranged weapons) and work them into the classes in an interesting way (you could make them function similar to Legiondaries to alter your gameplay in a fun and meaningful way but nothing extremely powerful). I'd also bring back PvP gear (either the MoP or WoD version of it). Class reworks should also be a major factor when it comes to making WoW great again.
Moreover, I'd probably remove World Quests (probably the worst content Blizzard ever created imo). Their rewards (basic gear that gets you into the relevant content but gets irrelevant rather quickly) would be replaced by an overhauled rep faction system that is tied to the different leveling zones and functions similar to the end game Suramar storyline (with a few options for repeatable content that can also involve dungeons, scenarios like the withered stuff etc.). I'd also add mechanics that allow you to speed this process up for alts once you've done these on your main (similar to MoP).
I don't think there need to be fundamental changes to how dungeons/pvp/raids work as they seem pretty popular as they are though maybe I'd prune some of the difficulty options according to player feedback.