1. Use other currencies: Singapore accepts many currencies, including USD, EUR and JPY. You can change these currencies into new ones at banks or money exchange shops in Singapore.
2. Use credit card or debit card: In Singapore, most shops and restaurants accept credit card and debit card payment. If you don't have new coins, you can pay with these cards.
3. Use electronic payment: In Singapore, many shops and restaurants accept electronic payment, such as PayNow and GrabPay. If you don't have new money, you can use these payment methods to pay the expenses.
4. Ask for help: If you encounter difficulties in Singapore, you can ask the local people for help. They may help you find a place to exchange money or provide other help.
In a word, you can deal with the situation that there is no new currency in many ways. Try to avoid carrying a lot of other currencies or cash, because this may bring security risks.