Fallout 4 has aged beautifully. You should play it again.

I'm actually playing it now! If you've played it before and want a bit of a change, but without changing everything (and are on PC), I recommend The Midnight Ride. Read through the mods it adds to see if it's for you, but it all felt good to me mostly. The power armour changes are very nice for me. You can add other mods on top of this too if you wish (Fourville and Sim Settlements 2 are two I've added on top of as well and also recommend).