Coming from someone who has not played PoE before

Hey guys little back story I have played Diablo, never played PoE. Games just don’t interest me anymore but path of exile looks like something I can play, stick with and there will eventually be hella content. I’m thinking about early access I know there’s 3 acts atm but is there plenty of content to do whilst we wait for the full game? Also I am a fan of events around certain periods of the year is that something the developers do or is it not their style? And lastly I presume once you have finished the story there is something to keep you playing, seasons etc? Sorry for the really bland questions as I say I am totally brand new and have heard it’s very difficult so just wanted to get a grasp but the idea of playing a game eventually with my music on in the background sounds great!