How can I make a running script cancel if a player resets?

I have this script which I made, but I want to make the script start all over once the player resets.

We need a bit more info for a specific answer for your case, but in general the Died event will be what you can use to detect the death of a Player.

You could put this in a different script, not very effective but it works

local player = playerhere
player.Character.Died:connect(function()
game.Workspace.SCRIPTHERE.Disabled = true
game.Workspace.SCRIPTHERE.Disabled = false
end)