I suggest you Hold on!
Although the price is now falling, you bought three BTC for $19,000.
The price is now $6,600, and your 3 BTC is not getting any less!
The price will return to $19,000! Maybe more!
If you sell now, you'll regret it!
Yeah selling now would not make much sense because it is already trading at a lower value and if you sell now so that huge loss you will have to incur could not be recovered and btc if start rising again atleast you can cover up some of your loses in coming time . So better to keep holding as you have done so far.