Increase the cost of weapons and tools.

(This is translated from Spanish using Google)
Once we create a world of survival in Minecraft, we have different objectives to keep us alive, such as getting wood, stone, food and minerals, which are very abundant in a world that is practically infinite. If you are a little experienced in the game, you can get the 36 iron items needed for a complete set of armor, weapons and tools in a matter of minutes once the game starts, which makes the game more "simple" than it is. That's right, even the 35 diamonds can be relatively simple to get.
My proposal or suggestion is to make armor and mineral tools more expensive and complicated to achieve. My idea is to add an item made with two or three items of iron, gold or diamond joining those two or three of minerals in the common interface or in a crafting table. This item will have the unique and exclusive functionality of creating armor, weapons and tools, instead of requiring only 8 iron to create a chest would require 16 or 24 of it, or for a peak would require 6 or 9 iron instead of 3, for example. And for the shield it would be the same with the addition that in the two missing spaces that new item is added in addition to adding shields of gold and diamond.
This idea arises because the game itself has no difficulty, or at least the one that is is quite simple, and adding costs a little higher would make us stay longer exploration in caves (which also need an update urgently) making us unprotected for longer than it should be, that is to get a lot of minerals and to make a suit of armor.