There's a few methods that may work.

Filter > Pixelate > Crystalize

Filter > Filter Gallery > brush strokes > splatter or distort > glass or distort > ocean ripple (all 3 are in the filter gallery)

A mixture of them may give you what you want.

As for the forums, I used to post a bit over at Photoshop Gurus. They're still active if you want to take a look around. https://www.photoshopgurus.com/forum/

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