Is the instability of sustenance and the absence of blessings in it considered a sign of Allah's wrath, and what is the way to attain Allah's pleasure in sustenance, especially with the conviction that sustenance is predetermined?

A lack of abundance in sustenance does not signify Allah's displeasure, for sustenance is solely in Allah's hands. Attaining Allah's pleasure and ample sustenance is achieved by adhering steadfastly to His path, obeying His commands, avoiding His prohibitions, diligently observing His obligations, frequently and earnestly supplicating, maintaining kinship ties, being sincere in supplication, ensuring one's food is lawful, and not rushing the answer to prayers. Indeed, supplication can alter a suspended decree.