To the OP:
Since you are from Bangladesh, you are probably more familiar with the economic situation in your country than we are, including the rampant poverty and lack of development and investment that is characteristic of your country.
To be absolutely honest, you are in a serious disadvantage in terms of both your poor grades and opportunities available for physics-related positions in Bangladesh (assuming there are any).
Furthermore, if I assume that "Tamira Hassan" (your PF handle name) is your actual name, then I assume you are a woman (Tamira I believe is Muslim woman's name). If so, then I'm sure you are aware of the sexism that is prevalent within your country as well in terms of employment.
I would need to ask you some further questions before I can give you any career-related advice:
(1) Have you looked at why your GPA was so low? Did you have difficulty with the academic material in physics?
(2) What is the possibility for you to pursue a second undergraduate degree in Bangladesh in a different field?
If #2 is possible for you, I would suggest that you take that instead, in a field other than physics, and seek to earn a high GPA.