Is it is possible to loosen 3b curls without heat ?

     I have been natural since 2007, so I'm pretty sure that my curl pattern is "set".  I'm a 3b with a 2 inch section (above the nape of my neck) that is a bit tighter wet or dry.  I co-wash 1 to 2 days a week, use leave-in conditioner, seal my curls with coconut oil and always air dry.  I have tried several products but none help to loosen the curl.       Does anyone have the same problem ?  What do you use to loosen the curl ?  I would really love to hear from any natural that have ideas. Thanks

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