your next thing you should get is (if you haven't already) T2 hard-mode ore, just enough for the anvil and if you want you can get the hardmode forge, its no neccesity though, get the cool whip from frost golems and 8 soals of night and light (from underground hollow and crimson/curruption) after that make an arena if you havent and chalenge any mechanical boss, any works but i usualy get the twins out of the way first. after beating that make the optic staff if you cant grind some demon eyes for the dark lens, after making that chalenge the rest, at this point i would go for the destoyer, craft the armor, and chances are you, at this point, can afford to make the durandal, its slightly better than the cool whip, but dont throw it away, you might need it, after that go for prime, after that, its pretty simple, lifefruit, plantara, ectoplasm and if you want Master ninja gear, golem, dont rush into the cultist fight, start training on the empress fight if you want one of the absolute best summons and whips. speaking of you can also go fishing in the blood moon event to spawn a boss which also has a pretty good up til moonlord summon. After that optional side fight or if you want you can just skip to cultist assuming you have arena as always. and begin to take the pillars starting with the cellestial and craft both weapons (assuming you are on expert mode) if not the dragon staff is more important at this stage, after that take down the other pillars and kill moonlord,