execute store result score random itemcount run random value 1..4
execute if score random itemcount matches 1 run data modify entity @s Item.components."minecraft:attribute_modifiers" append value {slot:"feet",type:"luck",id:"4444",amount:.2,operation:add_value}
execute if score random itemcount matches 2 run data modify entity @s Item.components."minecraft:attribute_modifiers" append value {slot:"feet",type:"luck",id:"4444",amount:.1,operation:add_value}
execute if score random itemcount matches 3 run data modify entity @s Item.components."minecraft:attribute_modifiers" append value {slot:"feet",type:"luck",id:"4444",amount:-.1,operation:add_value}
execute if score random itemcount matches 4 run data modify entity @s Item.components."minecraft:attribute_modifiers" append value {slot:"feet",type:"luck",id:"4444",amount:-.2,operation:add_value}
scoreboard players reset random