Considering the current perspective, 8 USD is good for Bangladeshi. AFAIK the current scenario is worst than that. Companies actually want to hire engineers 10k BDT which around 124 USD!! Same goes for upwork. The whole tech market looks totally unstable right now.
Thank you so much for your valuable inputs. A lot's of you suggesting full stack.However, I would like to know what is the opportunity for Mobile Dev? How do you see a mobile developer in upcoming years? Although, the app markets are full of apps and revenue is going downwards for both iOS and Android platforms.