Umm, you posted here a year ago. So it’s strange you’re saying you didn’t realize this forum existed.
This is an assumption on your end. VPN in itself is not against the rules but if they see a consistent issue where it’s combined with other factors and it can get you flagged.
For you to even consider VPN as a problem means you have read about this and know using a VPN to appear in other countries can cause problems. But it sounds like you did it anyway. Either that or just are jumping to assumptions and your issue is something else.
You should create a Rewards Support Ticket at https://support.brave.com/hc/en-us/requests/new?ticket_form_id=360001302431 so someone from Brave can look into things.