You can certainly use up the CA that you have on hand, before trying sodium citrate. But you can also make bath bombs with the CA if you want to speed that along
A little info about sodium citrate: when citric acid comes in contact with sodium hydroxide (NaOH, lye), the two ingredients combine to form sodium citrate. So by starting with sodium citrate itself, you achieve the same result, but without any need to adjust the lye calculations.
Here is more about that from, you guessed it,
@DeeAnna's site.