> a foundation I made for myself
Creative thinking requires an intent to be creative. Yes, it may be a delusion to imagine oneself as creative, one's thoughts to be original, but you have to begin with that idea if you're going to have any chance of actually advancing human knowledge. And the stronger wider higher you build your foundation-- your knowledge and familiarity with the works of humans before your time-- the better your chance of successful creativity, true originality, immortality.
Einstein thinks nothing of import without first consuming Newton and Galileo. While standing on their shoulders, he could begin to imagine another perspective, a creative reimaging of our physical universe. I'm fairly sure that for him, like for so many others, it began as a playful, creative thought stream, a What If juxtoposition between what was known and the mystery of unexplored ideas.
Your intent to create will make you creative. Entertain yourself and your thoughts, and share when you dare, and maybe we'll know if you're regurgitating or creating. But remember that you're the first judge and gatekeeper, and the first question is always, are you creative?