I guess you already did this, but just to make sure: could you verify in Cura that the checkbox "Enable retraction" is checked indeed? Then verify in Cura, in Layer view, that extraction is active (=small dark blue vertikal lines). It could have been disabled accidentally, or on purpose to try something, but that you have forgotten to enable it again?
White PLA is especially bad at stringing. Can you maybe try a different material?
Printing cooler is great but printing slower helps also (and travel speed fast). These strings look very thin and probably are easy to remove.
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