What is the lawful alternative to a bank if money is the sole source of income and cannot be invested in trade or partnerships?

Consuming usury is one of the major sins for which Allah has threatened those who consume it with war and the destruction of wealth and its blessings in this world and the hereafter. Therefore, it is not permissible to deposit money in usurious banks and take interest from them. Rather, one must invest in permissible matters.