Buy Starlink and resell it. You will have free high speed internet plus you will have an additional source of income. 
btw. 5 Mbps is quite slow, after all, we are in the year 2024.
We're talking about Bangladesh, I expect it to be slower than average. And $6 per month is quite low too.btw. 5 Mbps is quite slow, after all, we are in the year 2024.