After building a column of command blocks that looks like the one in my video, paste the following commands starting from the bottom command block and going up.
The bottom command block is set on "repeat", "unconditional" and "always active". All the others are set on "chain", "conditional" and "always active".
/enchant @a durability 1
/clear @a glowstone_dust 0 5
/effect @a levitation 1 20 true
/effect @a resistance 5 255
/execute @a ~ ~ ~ fill ~ ~1 ~ ~ ~1 ~ glowstone 0 replace air
/execute @a ~ ~ ~ fill ~ ~1 ~ ~ ~1 ~ air 0 destroy
/playsound mob.wither.shoot @a ~ ~10 ~ 10 .1
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MCPE JETPACK
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Command blocks