Sure! Here's a well-written line you can use:

"Bitcoin is down right now — a golden opportunity to buy before the next rally!"

Or a few more variations:

1. "BTC is dipping — smart investors buy the dip, not the hype!"

2. "Bitcoin is on sale — grab it while it's low!"

3. "Market is red, but the future is green — accumulate BTC while it's down!"

4. "BTC price drop = perfect entry point. Don’t miss out!"

$BTC