Exactly how do you upgrade gear?

Oh,Enchanting

:/

Diamondgear+netherite ingot=Netheritegear

Thank you. I could never figure it out

In a smithing table

Ok

that would be so great we could then break the block down to get 9 bars of netherite

Well you can turn a netherite block into netherite ingots in a crafting table

that should be possible technically but thats just op but it technically should be like that