the amounts can vary wildly based on available ad compaigns in a region, os, time of day , etc. As for not getting the amount earned, it’s common for some amount to roll over to the next period as viewed ads sometimes take a while to confirm.
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…
For new information, check bottom comment. Otherwise can review some of the below to see overall status since July 26, 2022. Brave’s List of Supported Countries OLD UPDATES BELOW: Can’t add more since April 4, 2023. Update: April 4, 2023 Only because it’s been a little while since I gave an update, thought I’d just do a small post. At this point they still have nothing solid to say about adding countries again, the new partner(s) they are hoping to add, or even of an ETA for the sunsetting of v…