ResizePotions

This data pack adds a recipe for new potions that can decrease and increase the player’s height. Potions can increase height by a maximum of 2 times or reduce it to 0.25.

If you drink

1 potion of increase - height will be 1.5
2 potions of increase - growth will be 2
3 potions of increase - growth will be 2, but to return to normal size you will need to drink 3 potions

1 potions of decrease - growth will be 0.5
2 potions of decrease - growth will be 0.25
3 potions of decrease - growth will be 0.25, but to return to normal size you will need to drink 3 potions.

command for obtaining recipes and potion ingredients - /function soupdata:player/giveingredients

command for getting potions - /function soupdata:player/giveplayerpotions

you can write "/scoreboard objectives setdisplay sidebar sizeAD21" to find out the player's height from -2 to 2, where 0 is normal size (x), -2 = 0.25x, 2 = 2x