If you are an ARPG fan, I don't know if I can recommend Last Epoch enough. That is even in its current Early Access state.

The build diversity is awesome. I realized, as I grabbed a notepad and paper to track upgrade paths for future characters, that this was going to be a game that had legs.

Where a large part of this experimentation and flexibility comes from is the skill leveling. You are able to select your class and level a skill tree as expected in the genre, however your skills also have leveling trees. As you level you unlock the ability to specialize in skills of your choosing. When you do that, the skill begins to level and you gain access to a modification tree allowing you to mold the skill to your play style. This has been awesome, and has provided variety similar to what you got with D3 skill modifications but with a lot more player choice, freedom, and flexibility in the builds.

With more classes and mastery classes, more campaign content, and a fleshed out endgame still in the pipeline I feel comfortable recommending Last Epoch to ARPG fans now.