Phantasy Star Online. They’ve tried to release sequels over the years - Universe, PSO2 - and failed miserably at capturing what made Episodes 1 and 2 great. There’s no way they would be able to just update the graphics without trying to “improve” something in the gameplay, or changing the loot system, or adding MTX, and would just fuck it up again.
PSO is so good that even now, 23 years after it launched on Dreamcast, there’s still hundreds if not thousands of people like me that still play regularly. Whether that’s offline on their GameCube or online in Blue Burst on PC on a server like Ephinea.
If you want some variety, I played a ton of PowerWash Simulator when I had COVID and it was fantastic. Just chill, not much thought required, and clean stuff with a pressure washer progression system.