Take a look at my video on how this pack works and how to use it:
https://www.youtube.com/watch?v=uDzsMHsbyvo&t=3s

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UPDATE 5/17/2020 8:09PM Revival Datapack Remastered: I completely re-wrote the code. Its written more efficiently.

There is no longer a teleportation menu, when you fail to revive all 5 times; You simply are put into spectator, like in hardcore mode. (mostly because I thought that seemed messy)

Ontop of that, there is now a 1 in 4 chance, that when you try to revive a Wither will spawn! The risk you have to take for cheating death.. ;)

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Heres part of the script from that video:
- This datpack changes the death mechanic of minecraft!
- When you die, you are given the chance to "Revive" from death!
- The way that works, is you are teleported to 1 of 4 "Revival Rooms"
- Each room is separated 1 million blocks from the world spawn!
- This is one of the 4 Revival Rooms!
- To revive, you must gather and place down certain items in the room!
- All players (who are suppose to be in that room) will teleport back to world spawn!
- To get to the 2nd, 3rd, and 4th Revival Room, you must die while trying to revive yourself!
- We are now in the 2nd Revival Room, you must now revive twice, to return to world spawn!
- As you can see, after reviving from the 2nd revival room, you are placed in the previous room; room 1
- If you fail to revive all four times, you will be placed into spectator! Like in hardcore mode!
- You are given he chance to continue in spectator, or shamefully restart from worldspawn ;)
- Make sure to check out my other datpack video "Coal Compression | Coal to diamonds!"