• Firstly, you cannot find out who liquidated funds from on chain analysis, you can only know a certain amount of Bitcoins moved from wallet A to wallet B (simply). Knowledge of how to determine exchange wallets could tell who withdrew their bitcoins from an exchange or who sent them there, but does not show who sold.

• About the stop loss indicator, I have not hard of any, they are private settings in trading accounts, with no public indicator for when they hit, imo.