Already everything bitcoin related is banned in our country still we are using bitcoin but recently government of our country may be more strict about using bitcoin. NAGAD, the popular mobile banking service of our country, is currently conducting a cautionary campaign in various ways to transact through Bitcoin in our country. They are using social media and leaflets as part of the campaign. Since we are involved with Bitcoin, these things seem scary to us. I already have some investment in Bitcoin and I am thinking of investing some more but at this time news like this is making me weak mentally.
I don't know what we should do at this point.
In my point of view, you can still invest in bitcoin as long as you invest bitcoin in foreign platform. Buy and store your bitcoin on a platform which is not tracked by your finance regulator of your country. Then when you want to sell your bitcoin, you can sell it on b*nance (as one of the largest trading platform) or any trading platform which supports a withdrawal into USD or into your FIAT directly.
He can always store his bitcoin for the moment in noncustodial wallets.
I am positive that sooner or later, his government will change their stance towards the bitcoin market.
Upon searching the Nagad website, I assume the OP is from Bangladesh.
However, as you said, they can use binance to convert their crypto to their fiat, Bangladeshi (BDT).
But with more and more countries accepting crypto, I believe this country will loosen their approach towards crypto.
There are also a lot of Bangladeshis here in the forum, it means, they have their means of using crypto or converting crypto to their fiat.