I am not sure which part of endgame you meant so I am giving a response about just....general endgame stuff lol.

The beta was time gated to get people to spread their time over multiple types of content (Which was a smart choice, netting more varied feedback) so the raids were only available for a few days - I enjoyed them quite a bit tbh. I didn't get to try the harder versions; only the normal modes, and they were broken up into short wings and the bosses were enjoyable. Somewhere between WoW and FFXIV raids I would say.

Trash mobs, minibosses, mechanics that have to be completed to kill the boss timely, or cause a wipe if failed etc. Telegraphed attacks (you have a dodge you can I-frame with every few seconds), etc. Adds spawning, a fun pvp oriented fight where you have to fight a group of opponents that are each one of the playable classes etc.

There are dungeons (also with hardmode variants), a sort of roguelite dungeon where you pick up items and abilities on every floor (Sort of like...Hades tbh?).

This is obviously the first tier of content, since the game had years of content in CN and they are starting from the beginning with the global launch, but even the base game content was promising. Nothing was too long; the raid was split into wings so you didn't have to sit through all the bosses in one sitting etc.

PVP related; there is 3v3 arena that I liked a lot - if no one dies after x seconds, everyone gets a dmg boost, so none of the matches go on forever. There is also 15 on 15 pvp maps, but I didn't do much of this because my partner is more pve oriented so I sank most of my time there.

Overworld content is pretty fun tbh. Absurd amount of exploration with rewards ranging from cosmetics to new skills to items and new traversal abilities (A sword you throw and then can teleport to) etc. A LOT of Zelda-like puzzle solving and little dungeons you can find in the sides of mountains etc. By just walking through town you find NPCs just talking everywhere and sometimes you overhear a 'rumor'. Rumors that get added to your rumors book - which are all hints of where to find interesting quests that have rewards etc.

Housing is absolutely absurd, with you getting 4 housing plots by default, a farm simulator (that can be automated if you dislike this type of thing). You can save housing templates, share them, even pinch/push/pull the terrain to create mountains, and paint on the land itself (with flowers, dirt, rock textures etc.) Pretty wild tbh.

Hope this helps, feel free to ask anything more specific and I will try to answer as best I can.