I have only 30c how to spend them before changing account region

Contact Apple Support directly, they will help you clear your balance: Get Support

Then see this Apple article:  Change your Apple ID country or region

Change your Apple ID country or region - Apple Support (KW)

—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. 📝
• Chat using Messages. 💬

—Then—

Click ▶︎ Change Region. 🌐