You can bounce on slime block infinite, although it's small but it's fun

Step 1: Place a slime block and get a slow falling effect

Step 2: Step & jump on slime block

And you are 100% done. Everything now you look now are shaking, because you bounce infinite on slime block, every bounce launch you up 0.03425 blocks

You can check that by pressing F3, at "position y" in XYZ

This work on 1.13 until the current version