Minecraft 1.18 has completely transformed the game's world generation. Players can now dig to Y=-64 and the world height is now at 320. Mojang also redesigned the game's ore-generation system to encourage exploration and balance the game's mining. This has revolutionized the traditional way of getting diamonds. Previously, you had to dig down to Y=11 before strip mining.
Players have changed as well as the game.
Players don't have to abandon their old ways if they don't wish to. You can still find diamonds in the same way you used to, which is by strip mining at approximately y=11.
This part of the world still has all the old goodies, including redstone, lapis and gold as well as iron, coal, and a few diamonds. At this level, the frequency of diamonds has decreased and increased with each step.
If this is the way a player does it every day and they want to continue doing it, then they can. There will be diamonds to mine.
Mineshafts are long and spiraling tunnels that contain mine tracks and chests. They can be thought to be an old mine. These structures have the same advantage as many other structures in the game: they let the player see many blocks. Because of the large number of blocks that players have access to, it is possible to find diamonds in deeper mine shafts.
Ravines are a key part of the game. Massive scarring on the land exposes huge areas to air. This can reveal deeper caves, lava falls, and diamonds if a player is fortunate.
Although there isn't an increase in the spawning rate of diamonds within ravines, it isn't unusual to see them in the ravines' lower walls. This is particularly true for ravines that spawn deep within the earth.
The legend that diamonds can spawn near lava is one of the most popular and oldest. Although there isn't any code that allows diamonds to spawn close to lava pools, caverns can see the same idea as ravines: large, open areas at the same level where diamonds spawn.
Diamonds became more common in the deeper layers of the earth after the ore generation map was updated. The new optimal level for strip mining will be Y=58. Diamond spawns are not compatible with any lower-grade bedrock. It's technically less effective if it's higher due to the diamond spawn rules.
Three tall tunnels with two blocks between them are the best strategy for strip-mining. Each tunnel can see the blocks to their left and right, and each tunnel has its own set of blocks. A three-block high, three-block-wide area can be used by each tunnel to hunt for diamonds.