It depends on the reason for which your bank blocked your fund. If it has been blocked due to some court order, you are on the mercy of the legal system of your country. But if it is just precautionary block, a legal notice from your lawyer should do the trick. So try to find out the reason for the block and your bank is legally liable to provide you the information. Once you have the reason in, prepare accordingly. Any precautionary block has a limited timeline that depends on your local law. If it has exceeded, the reason might be different and might not be joyful for you.
I do presume out that this is some in connected with crypto in terms of those funds which is tied up onto your bank account or something.If crypto regulations isnt clear
or doesnt have positive sentiment on your country then you would really be facing up these kind of issues which neither they would really be releasing those funds off
or would be locked for some time.