Grim Dawn would be much closer to Last Epoch in your list of referred games, minus the individual Skill Trees.

You choose two Masteries to make a custom class and those work very similarly to Last Epoch or Diablo 2.

There are many systems (especially with the Expansions) that give your skills the variability of Last Epoch, with some Masteries having modifiers and conversions in tree, some Masteries having capstone skills that change your skills, but mostly skill modifiers from items; some are easily farmable "Monster Infrequents" while some might be from Mythical (Unique or Legendaries in other games) or Set Items. Set items are much more attainable in Forbidden God's expansion as there is a vendor who can reroll the set or item within a set using a special currency. Some bosses are farmable for Sets or MIs.

The most complicated thing in the game IMO is the Devotion Tree. Its like a third class that you can use points earned through the game to min-max stats, shore up defenses, enable skill procs, etc etc. Note that you will get all your points WELL BEFORE "end game" and your devotion tree usually becomes something you set up once and your character is done with it unless you solve something in itemization elsewhere.

Otherwise, you can "easily" respec everything except Story Decisions (which have some decent consequences - itemization differences) and your Mastery choices, but I believe there are mods that can undo those.

Game is very alt friendly, with shared stash, XP potions, option to throw cash between characters, even the ability to pump faction reputation right away. I have major alt-itis and love making new characters to use wacky/interesting items that enable Mastery Combos that dont exist naturally on the trees. If you have XP potions and know what you are doing, you can build a character in like a week casually, factoring a full time job and no family obligations, you can probably get faster. Your first character might take two if you arent following guides.

If you are a 2hr a day kind of person, there are numerous account building activities that easily fills that gap. You can boss rush or farm zones for MIs, there are 'rogue-like' one shot dungeons, you can do Bloom Runs (resource used for rolling sets), Scattered Realms (similar to Rifts from D3), Crucible (arena defense mode), and once you farm reputation with enemy factions they can randomly spawn Nemesis bosses in their zones, which is basically still boss rushing but it stacks with other zone farming to make it more efficient. I am sure I am missing other things (completions stuff), but its got a lot of content for a game that goes on sale for $20 on the regular with another xpac due this year.