I made a mob trap recently but it did not seem efficient so I found out caves affect your mob traps but how do I get rid of the caves easily or at least stop the mobs from spawning in them.
Minecraft – How to easily remove caves for the mob trap
minecraft-java-edition
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Best Answer
This is less of an answer (unless you'll accept "no way" as one), and more of an extended comment.
Missing a shaft or two is not a big deal. But lighting up caves for spawner efficiency is a huge work, as you need to proof all caves in 128 meter sphere around your position at killing floor. I've done it once and vowed to never again build a spawner in the ground. See: I made shafts every 20 meters in one cardinal direction, starting from a main shaft in the other direction (like a branch mine), making a circle of 140, to be sure.
That gives 280 + 280 + 280 + 260 + 240 + 220 + 180 + 100 = 1840 meters of pure mining, without spelunking, per level of which you'd want three (to cover 64 meters of depth at 20 meters between levels). Adding vertical access, some ease of navigation and diagonal shafts that you'll dig a lot of to find caves by sound we have quite above six kilometers of digging, plus cave adventures (imagine those multi-leveled jagged open caves with holes in the ceiling raining creepers!).
And the surface. You have to light up almost 20 acres of land, more than 70000 square meters - or always be sure to sleep the nigh over.
So, my advice is: make your spawner in the sky. 128 meters above surface, or 100 above ocean, and you're all set and are only dealing with its ugliness (build it away, go via portal).