https://batuhangg.com.tr/en/how-to-become-tiny-in-minecraft-1-21-no-mods/

Minecraft Tiny Boots (1.21+)

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/give @a golden_boots[custom_name='["",{"text":"Cüce\'nin Altın Botu 🧪","italic":false,"color":"green","bold":true}]',lore=['["",{"text":"You","italic":false,"color":"white"},{"text":"Tube","italic":false,"color":"#ff0000"},
{"text":":","italic":false,"color":"light_purple"},
{"text":" ","italic":false},{"text":"BatuhanGG","italic":false,"color":"gold"}]'],minecraft:enchantments={levels:{'minecraft:unbreaking':255},show_in_tooltip:false},attribute_modifiers={modifiers:[{type:"generic.movement_speed",amount:-0.3,slot:feet,id:"generic.movement_speed",operation:add_multiplied_base},{type:"generic.scale",amount:-0.9,slot:feet,id:"generic.scale",operation:add_multiplied_base},{type:"generic.jump_strength",amount:-0.5,slot:feet,id:"generic.jump_strength",operation:add_multiplied_base},{type:"generic.attack_knockback",amount:-0.4,slot:feet,id:"generic.attack_knockback",operation:add_multiplied_base},{type:"player.entity_interaction_range",amount:-0.4,slot:feet,id:"player.entity_interaction_range",operation:add_multiplied_base},{type:"player.block_interaction_range",amount:-0.3,slot:feet,id:"player.block_interaction_range",operation:add_multiplied_base},{type:"generic.attack_damage",amount:-0.5,slot:feet,id:"generic.attack_damage",operation:add_multiplied_base},{type:"generic.step_height",amount:-1,slot:feet,id:"generic.step_height",operation:add_multiplied_base},{type:"generic.gravity",amount:-0.5,slot:feet,id:"generic.gravity",operation:add_multiplied_base},{type:"generic.max_health",amount:-0.3,slot:feet,id:"generic.max_health",operation:add_multiplied_base},{type:"generic.armor",amount:-1,slot:feet,id:"generic.armor",operation:add_value},{type:"generic.safe_fall_distance",amount:-0.5,slot:feet,id:"generic.safe_fall_distance",operation:add_multiplied_base},{type:"player.sweeping_damage_ratio",amount:-1,slot:feet,id:"player.sweeping_damage_ratio",operation:add_multiplied_base}],show_in_tooltip:false}]