Resources for improving at bullet chess

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Avatar of arie64

I have been trying to improve at this style (time control 2/1) and am stuck at around 1600 although on a good day I have done a little better. Is there a recommended club here with resources for learning? Or coaches who specialise in bullet? I've viewed all the videos here I could find, which helped a little. And I have the Nakamura book. It's possible I have reached my limit but I think I could advance further. Thanks!