What is the ruling on fearing a cut-off of future provisions?

Fear of future financial instability contradicts certainty in God and His Lordship. God has guaranteed provisions and does not withhold what He has given, and no servant will die until they have received their destined sustenance. This is indicated by His saying, the Almighty: "And there is no creature on earth but that upon Allah is its provision" [Hud:6], and "And how many a creature carries not its [own] provision. Allah provides for it and for you." [Al-Ankabut:60], and "Whatever Allah grants to people of mercy - none can withhold it" [Fatir:2], and "And if He intends for you good, there is no repeller of His bounty." [Yunus:107]. In the Hadith (definition): A person's sustenance, lifespan, deeds, and whether they are wretched or سعيدة (blessed) are all written while they are in their mother's womb.