What is the optimal way to invest end-of-service benefits to achieve a halal profit, given the lack of trust in the Islamic credibility of Egyptian banks and the lack of experience in commercial partnerships?

It is permissible to invest in Islamic banks according to the Shariah-compliant Mudarabah (definition) (profit-sharing) principle. One must investigate which of these banks are most committed to Shariah regulations by asking knowledgeable and experienced scholars. Mere doubt does not prohibit dealing with them, and an error in one transaction does not imply error in all transactions. There is a need to deal with them to encourage the Islamization of financial dealings and to provide alternatives to usurious practices. They mitigate and contend with evil, which is considered in Islamic law.