Your equipment has nothing to do with what your progress is in the game. Since you have hardmode items though, I'd assume you have beaten WoF? Have you beaten all three mechanical bosses? If not then beat them then beat Plantera, then beat Duke Fishron, then beat Golem, then beat the Lunatic Cultist, then beat each lunar pillar, then beat Moon Lord.
You didn't explain anything at all, not even on what platform you are playing so sorry if my explanation is vague.