I really want a new MMO, not necessarily a sandbox but more of a WoW styled MMO, like WoW and SWTOR. SWTOR is dying because EA drained its funding, and WoW is well... old. I want a new, extremely pretty MMO that is raid focused.
Have you tried Guild Wars 2? It's free nowadays with some limitations (which are really okay).
Other than that you could The Elder Scrolls: Online, although it's Buy2Play. EverQuest and TERA come to my mind, too. I would also recommend you ArcheAge but that's because I love this game haha.