It was forged by a being that was super old and didn’t have any death on the horizon like mortals have, and had cruelty, malice, and a will to dominate all life poured into it by another nearly-immortal being. It sat for two and a half thousand years doing diddly squat, passing out of all knowledge.
My point is, it’s patient.
What’s 500 years when compared with eternity?
Maybe I’m reading this wrong, but it sounds like you’re saying Celebrimbor forged the one ring, and Sauron poured his malice into it. That’s incorrect: the one was Sauron’s creation, which he made using the knowledge he gained from assisting in the forging of the seven and the nine.