My country (indonesia) is not supported no more

Kinda yes. That is how it seems to be for the moment. You’ll have to wait till Uphold / Gemini support your region again or a new custodian is brought in to support your region.
You’ll find some old updates at

Well, no. Brave needs to announce the exchange’s name if they bring one in to make sure that they will support.
https://community.brave.app/t/psa-current-faq/464018/25?u=smartyaadi