How do I make a dimension that makes a (infinite?) dungeon throughout the dimension?

Structurds

This made me laugh unreasonably.

You could make a structure that is super common in it, the only problem is, is that it wont align properly (at least i dont think so)

Make the whole dimension air, and when a player enters the dimension place a structure that is a room with four blocks special blocks on the four walls. When the block is right clicked it chooses a random room and builds it. All rooms have these blocks so the player keeps generating the dungeon as they explore. Hope this helps!

Follow this guide to make the dungeon randomly generated,

It's super handy and well made.

https://mcreator.net/forum/62582/guide-random-generated-structures

:)

Sorry dude, and this is probably an old topic but I don't care to check,

any sort of endlessly generating structure placed inside of a dimension would cause the game to crash because of minecraft's built in structure generation limit. 

the structure generation limit is also what causes some structures that are super common to never generate at all :/