You use cross save to share an account across other platforms. Anything on those platforms at that time, became dormant.
Your characters are PSN characters being shared to Steam. Regardless of which platform you played on, all progress, triumphs, characters, etc, is being made on this PS profile.
If you cancel cross-save, all of the above will become unavailable on Steam, it will be playable on PS only. Whatever account you had on Steam before you cross-saved (which may be completely blank) is what will then appear for you when you launch the game on Steam.
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