I know, I know. Light up caves around, make sure you're 25 blocks away, I've already done that.
I made a simple 20x20 mob grinder, with 2 levels. The chamber is 23 blocks tall (because I want exp for enchants) so I made a little AFK hidey-hole a few blocks away from the killing area, making sure to dig down a few blocks. Some mobs DO drop, but 50% of them die on impact. Nonetheless, it's very slow. In the tutorials I've watched, they have tons of mobs dropping constantly. I get 1 mob every 20-30 seconds or so. Obviously, I don't get nearly enough levels for enchants. Help?
I have lit up the surrounding area, but I didn't know about the 128 blocks thing. Should I rebuild the entire grinder up 128 blocks, or can I just go up to Y128 myself (since im the player and mobs spawn around me)? Yes, mobs are dropping, but it's quite slow.
Are you playing in a server? Cause if you do, it will only work if everyone is in the AFK spot.
However if you don't try adding trapdors at the platform edges, make shure you removed every single torch inside the farm, you let no holes in the ceiling/walls and add some pilars in the platform to make the mobs's pathfinther work.
You can allways make a new farming spot 128 blocks above the farm or make the farm at Y:161 above an ocean biom.