execute store result score random itemcount run random value 1..5
execute if score random itemcount matches 1 run data modify entity @s Item.components."minecraft:attribute_modifiers" append value {slot:"head",type:"movement_speed",id:"1111",amount:.2,operation:add_multiplied_base}
execute if score random itemcount matches 2 run data modify entity @s Item.components."minecraft:attribute_modifiers" append value {slot:"head",type:"movement_speed",id:"1111",amount:.15,operation:add_multiplied_base}
execute if score random itemcount matches 3 run data modify entity @s Item.components."minecraft:attribute_modifiers" append value {slot:"head",type:"movement_speed",id:"1111",amount:.1,operation:add_multiplied_base}
execute if score random itemcount matches 4 run data modify entity @s Item.components."minecraft:attribute_modifiers" append value {slot:"head",type:"movement_speed",id:"1111",amount:-.1,operation:add_multiplied_base}
execute if score random itemcount matches 5 run data modify entity @s Item.components."minecraft:attribute_modifiers" append value {slot:"head",type:"movement_speed",id:"1111",amount:-.15,operation:add_multiplied_base}
scoreboard players reset random