Shrink. lets you explore Minecraft at a fraction of your usual size. Shift-right-click the Personal Shrinking Device to shrink to roughly a quarter of a block and reach tight spaces without breaking blocks. Available for Forge, NeoForge and Fabric on Minecraft 1.16.4–26.3.
Rent your own Minecraft server and install Shrink. with one click from the server panel to explore those tiny corners in your world.