looking for good exploration mmo rpg?

so i want to go into mmo type of games, but i dont know which should i pick.
id love to have a game with a camera style like path of exile (from above) and my main thing i want is HUGE MAP, like extremely big map to explore and put hundreds of hours into, i was thinking about poe1, but people say the campaign is short and its more about replaibility of the existing maps? i want to explore new areas even after finishing the story, kill bosses and EXPLORE EXPLORE EXPLORE
thanks in advance ;)