There are 2 options as to why this post exists: This user is either a noob new player or they are trolling. OP, if you are new, and are using a decent loadout, and still struggling, git gud (Stay with me here). It sounds mean, but really, this is the 3rd-final boss if you don't count the pillars, and it will be difficult for new players. There is no set of armor, nor weapons, accessories nor buffs (Not counting the numerous cheeses here) that will automatically let you win. You need to practice, hone your skills, and above all, don't give up. I was in your position once. It gets easier. Just practice, and something will just click, and, in no time at all, that lizhardian idol will be smashed to bits on the floor.
UPDATE: I have checked the recent posts of the OP. They are probably a troll, making such notable statements as: "I have a confession to make. I have never played Terraria a day in my life. Every single thing that I have said about the game was me guessing. I refuse to play a game that is just 2d Minecraft.", "Yes. I saw this site and thought 'I don't really know anything about terraria, but it probably has ichor, beds, toilets, and poop'" and I' have never played terraria, yet I think I am knowledgeable enough to make 15 suggestions''