The external Kingston XS2000 SSD works well enough, but doesn’t quite reach its full speed potential on Mac because of Apple’s design choices.

With the massive bandwidth available for USB 4 and Thunderbolt connections, external SSDs are generally the best way to get more storage on a Mac. Typically compact, they can work at about the same speed as Apple’s own internal drives.
That is, assuming you get a Thunderbolt one. The Kingston XS2000 is not that.