Hi farhan, I am also Bangladeshi. Bitcoin and cryptocurrency is still illegal in Bangladesh. Recently Bangladesh Bank has banned again cryptocurrency by showing it as a means of helping in terroristic activities and Money laundering. So you can work here and cryptocurrency trade with your own risk.
If there is such a persecution of bitcoin users in your country to the point you may get charged with money laundering and other charges like the ones you mention, it may be a good idea to stop using bitcoin or to at least consider in a very serious way to move out of that country especially if your income comes mostly from cryptocurrencies and you get almost nothing from fiat currencies.