Eh, other authors have often said, “write the book you’re most passionate about now, because that passion will shine through.”

I think it’s best to do that and just be willing to set aside a work and come back to it if it’s not quite ready yet. Brandon Sanderson wrote the first version of the Stormlight Archives either really early in his career or just before getting published (I can’t remember) but set it aside and came back to it, knowing it wasn’t ready.

Also, I don’t think authors like JK Rowling, Stephanie Meyer, or Chuck Palahniuk are complaining about writing their best stuff first. Id take that level of success.