A very satisfying way to immerse yourself in Minecraft adventure is the resource pack, because it allows you to have available to numerous customization.
Especially in Across The Time 2 it will be much more developed than in the first, as it will add the customized items such as new weapons (knives, masses, legendary weapons), various objects specially modify for this adventure (Sovereign Scale Chaos, keys, quest Object).

Resource pack – 1.17 v2.0.1

Also, the resource-pack allows including many customs sounds. 
Of course not to mention a soundtrack with new original music composed for the map entirely. 
The resource pack will now directly integrated into the map.

Here a track of the original soundtrack already composed for the map :