You have just answered your own question. Using black and white you can see that many of the fabrics have the same size scale to the print patterns and have too close to similar values.
You want to get more separation in difference between your lights, mediums, and darks.
Right now, your mediums and darks are more alike than different.
I truly like your color palette. I agree with Tslowery, if you want, just finish it and send it to me!! :-D I'd love to have it as is!
Otherwise, I would delete the zebra print or the fourth print from the left in the top row. You didn't use the stripe print in your block, and I would continue to leave it out, but maybe use it in sashing or borders.
The reading reference materials suggestion later in this thread is excellent.
Thanks for sharing.