1. Keep the earring falling off.
2. Go to the jewelry store you bought, communicate with the clerk and ask for help to replenish the goods.
3. If the purchase time is not long, you can provide proof of purchase and get better service.
If the jewelry store can't provide supplementary services, you can try to find a professional jewelry repair shop for maintenance. If the earrings are of high value, you can consider looking for a recycling store or sending them back to the original manufacturer for repair.