I interpreted your post in two separate ways; the first one, @lowner answered perfectly. 
Im not sure that is what you’re describing, however, . So, I have a couple questions… Do you mean that your current Brave Rewards “Estimated Earnings” is STUCK at 2.7BAT and WILL NOT go past 2.7? Or, is that 2.7 the MOST BAT that you have been able to earn, but that you have seen other users who earn more? And, you mentioned that you live in Serbia?
AFAIK, Serbia is one of the recently unsupported regions. My understanding is that this “support” is only applicable to users’ ability to connect to their Uphold or Gemini wallet. And since users don’t need a custodial wallet to be eligible for earning Brave Rewards, as long as there is an active ad campaign taking place in your region (
https://brave.com/transparency/ ), according to BRAVE you should still be earning BAT; regardless of what is going on with Uphold and Gemini not supporting multiple regions. That is why I am asking whether your earnings have stopped. Or, whether you meant that you couldn’t earn any BAT beyond the 2.7.
Here is the thread 
I was reading…