Sounds to me that being reject was super valuable to you guys anyway and instead of being "accelerated" you'll be able to go in your own speed the way you want with your product, not as YC, VC's or anyone else wants, which can easily "accelerate" you into the void and add extra level of stress to the one already, because imo investors are more like all-or-nothing types, when for you building "normal" sustainable business, that can later be sold for some X-XX million amount, is viable option as well.

Good luck and keep building! :)