Call the cooldownShares function to initiate the unstake process as follows. Note that slvlUSD has 18 decimals, so if you were to unstake 5 slvlUSD, your amount would be 5000000000000000000 . You can also use the balanceOf function in this contract to fetch your total balance and use it in the shares field.
Once the cooldownShares transaction is complete, wait 2 seconds, and then call the unstake function. The receiver address is your wallet address which was used in the above transaction
Once the unstake transaction is complete, you would have received lvlUSD in your wallet