I have to spend remaining balance to change the region. Please help

Buy something more expensive than your balance and use a different payment method for the excess amount; if you can't, ask the iTunes Store staff to zero it.

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—First—

Make a request to zero out any remaining balance on your account by contacting Customer Support by phone or chat:

• Call Apple Support at 1-800-APLCARE. 📞
• International Support. 🌐
• Contact Apple Support. 📝
• Live chat using Messages. 💬

—Next—

Cancel your subscriptions and wait until the end of the subscription period. 

—Then—

Click ▶︎ Change Region. 🌐