I had some explanations for my 3D renderer here: Carrier 3D (unfinished work in progress) - #14 by kwx . There’s additional discussion further along in the thread.
In short, I think there’s no magic “make it 3D” shortcut - you can try using one of the available extensions such as the raycasting one, but as far as I know there isn’t a general purpose 3D library available for Makecode. My renderer had a lot of limitations that make it difficult to use, largely because it was aiming to support hardware devices.
But by all means please keep investigating - it feels very rewarding once things start working 