how do i change the strenth of me hitting the ball in my volleyball game

it works like this:
execute as @a[tag=player] at @s anchored eyes if entity @e[tag=stand,distance=..2.5] if score @s use matches 1 if score @s cooldown > @n[tag=Cooldowncap] cooldown run function my_datapack:marker
use is 1 if i use a carrot on a stick, tag "stand" is the ball
#summon marker execute positioned 0.0 0.0 0.0 rotated as @s run summon marker ^ ^ ^1.6 {Tags:[marker]} #apply stats from marker to ball data modify entity @n[tag=stand] Motion set from entity @n[tag=marker] Pos kill @e[tag=marker] 
i have no idea how i would change it gameplay wise nor do i know how to implement it code wise