What is the best minimal combo (in addition to KDP)?

I have 11 titles self published on Amazon. What is the best combo of additional publishing platforms, like Ingram Spark, Draft to Digital, Street Lib, Goodreads, Barnes and Noble, Apple, Google and others? Now I am seeing Spotify entering the fray. I have a few of my KDP books on Barnes and Noble and a few on Ingram Spark and Draft to Digital. I am looking to publish on the least amount of platforms with maximum coverage and distribution. Is there a best combo in addition to KDP? I would like to get more into libraries and bookstores.

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