Most ARPGs including PoE the trick to leveling fast is staying below the zone level so you are getting bonus xp per kill. Not so low you are getting owned. It requires skipping over a lot of things and only attacking a large pack for xp or something that makes it worth the time it takes to kill something.
I find that kind of leveling not to be as fun when you first start out in a new league. When I make an alt I’m sure I’ll be skipping lots of kills. As I hate leveling alts.
Last Epoch is one of those I need to get around to playing at some point.