I am in Nigeria. how do i receive my brave rewards pls? i am told that my region does not support uphold and gemini. so how will i get my rewards paid?

Not at this time. Though Brave is gradually releasing on chain payments which may eventually be open to you. But no idea when it will appear. You may want to check out PSA: Current and upcoming changes to Rewards and Creators and make sure to read the official articles I link to there.