This Datapack allows you to create elevators in Vanilla Minecraft!

Installation:
To install the Datapack you have to unzip the downloaded file, put it in your data packs folder of your world and type /rerload in the chat.
If everything worked a message should show up, saying "[server] reloaded elevator data pack".

Make an Elevator:
Place a note block down and configure the note it plays by right-clicking on the block. This determines how far up or down the elevator will teleport you. Then power the note block.
Use the Elevator:
Stand on top of the note block and jump if you want to go upwards or sneak for going down.

Limit the Elevator:
If you're on the highest level of your building and you don't want the elevator to take you upwards again, just place 3 blocks above the note block an obsidian block. Now this note block can take you only down.
To prevent the opposite thing from happening place an obsidian block underneath the note block. This one will take you only upstairs.

If you have any suggestions to improve this data pack, feel free to comment below.