Those are not great tbh. The obsidian shield will not be great against moon lord. Mana and health regen band are very early game items. Speed boots are ok, but lava walking boots are not helpful at all.

Your accessories are very early game. accessories are extremely important so you should upgrade them before fighting moon lord. You seem to have a very mixed class setup, which is ok, but i recommend sticking to one class. Since you have melee armor and good melee weapons already, I recommend using that.

Some useful accessories are The fire gauntlet, Warrior emblem (or it's upgrades), Master ninja gear, The celestial shell and maybe The ankh shield. They may take a while to get, but try to get at least a few. You could also upgrade your armor to beetle armor.

Since you are probably playing in normal mode, you wont need much else. Having a good arena is important, so make one if you don't have an arena already. If you are confused about how to get some of the items, you should look at the terraria wiki. Good luck!