It gives 1 speed every time I press the button, but it resets when I die or quit the game.

[hollow river]

Because you need to store the data inside of a datastore

[ruby pond]

what's wrong here

[scenic tulip]

create a int value inside of the player object and change that value with the speed. Then create a CharacterAdded event that changes the humanoid walkspeed to the value that you created.
Now when the player quits you have to save it in a data store

[ruby pond]

ok i try

[left needle]

** You are now Level 1! **

[ruby pond]

it works but my speed is more when i die