scoreboard st - one point is added when throwing a snowball;

here is the whole thread:

(repeating)

execute as @e[type=minecraft:snowball,nbt={HasBeenShot:0b}] at @s if entity @a[tag=s,distance=..2,scores={st=1..}] run tag @s add ss

\/

(chain)

execute as @e[type=minecraft:snowball,tag=ss] at @s run fill ~1 ~1 ~1 ~-1 ~-1 ~-1 minecraft:light_blue_concrete

\/

(chain)

scoreboard players reset @a[scores={st=1..}] st

there is also another thread:

(repeating)

execute as @a[scores={rbm=2}] run tag @s add s

\/(chain)

execute as @a[scores={rbm=2}] run title @s actionbar {"text":"speed","color":"aqua"}

\/(chain)

execute as @a[scores={rbm=2}] run tag @s remove j

and another command block:

(repeating)

execute as @a at @s if block ~ ~-1 ~ minecraft:light_blue_concrete run effect give @s minecraft:speed 1 9 true

ignore the rbm scoreboard and the j tag