Super valuable reply @fractalizer! Thank a lot! No I didn't know about those platforms, will definitely keep an eye on them. It's one of the bad side of self-publishing, as one must be his own "agent", aware of the ocean of possibilities and out of them, find the more adapted. Double blade of internet, so many things, hard to sort and see when it worths the effort or not.
Yes, super helpful! Also great to see other self-publishers. Respects .)