How can pensioners increase their income to cope with rising prices, especially with the prohibition of dealing with usurious banks and their lack of knowledge of Islamic investment alternatives?

Sustenance is from Allah and is not sought through disobedience. The best way to seek it is by obeying Allah and fulfilling His commands. For whoever fears Allah, He will make for him a way out and provide for him from where he does not expect. The Prophet, peace be upon him, encouraged fearing Allah and being moderate in seeking sustenance, by taking what is permissible and abandoning what is forbidden. Placing money in interest-based banks to gain interest is clear usury, and it is not a permissible solution for retirees. Rather, the solution lies in contentment, patience, and searching for lawful alternatives.