Stellaris

Stellaris, while it's a known game from 2016...

There actually have been several large expansion packs which made it better, and harder to survive in, as well as bringing a feel of an "endgame" more than just taking over many planets until you are all alone.

Starting with story expansions that makes things more interesting than just "kill or be killed":

More race options, as well as the beggining of the threat of "life" in the universe:

and

Adding end game ships and power:

Ending with their latest trailer from an expansion going out right now these days, apparently to make things even more interesting:

There is more to this game than just the original, so it looks worth playing over again (or start playing it), not considering it as a finished game that's from the past.

-Have fun

Battles now are on an epic scale, but at first its hard to see what all the new DLCs do for the game lol

This being on a 2 players multiplayer server:

Allies (NPCs):

Enemies:

Effectos of a station's debuff on the mighty enemy fleet:

Before engaging:

And after:

Quite a huge difference, right ?