Larian Studios is still working on the early access of Baldur's Gate 3, and there's another update just around the corner. This one comes with changes to the game's story, the first yet in its early access period, but that also means you'll need some new saves.
Much like Larian's previous work on Divinity: Original Sin 2's early access, the upcoming update will make previous Baldur's Gate 3 saves incompatible with the current version and onwards. The nice part is that this patch, however, won't necessarily mean you need to wipe your file just yet.
In a Steam update, Larian says the early access will essentially fork into two versions. Each patch will also have a secondary branch, which will allow players to keep playing the previous version of the game with their compliant save games. The primary branch, meanwhile, will continue updating and staying current. You won't be able to check out any of the new content in your current game, but hey, you'll also be able to finish out that first act run you worked so hard on.
Full instructions can be found in the Steam blog linked above. Larian also recommends that, if you're unsure about whether you want to keep current or not, it's probably best to disable automatic updates for the time being. That way you can stay on whatever version you're on now, and once you're ready, you can hop back up to the main version and roll a new character. Maybe you can dream up a more interesting character while you're at it.
Ultimately, this is a good reminder of where Baldur's Gate 3 is right now. Despite the hours that players have been sinking in, failing their dice rolls and romancing the night away, it's still very much an early access. It's a higher level of production than you might expect, but major pieces are still in development. So far the early access really only covers one hub, albeit a pretty large one.
Ultimately, it's best that you don't get too attached to any characters you make. My Githyanki warrior, whose proclivity from shoving and throwing items comes from a respectable football career at Sword Coast Tech before it was cut tragically short by foul play from a rival team's mindflayer (let me have my headcanon), is certainly a fun character to roleplay. I also know his time is short, and I'll be rolling someone new once Baldur's Gate 3 leaves early access.