Have firm conviction that khatimah bil khair (blessed ending of one’s life) is the most superior and perfect blessing (of Allah SWT). Pray for this husun e khatimah. Beseech with humility, especially, after the five daily prayers. (At the same time) also, be thankful (to Allah SWT) for the eman (faith) you have now. This will according to the promise (of Allah SWT)
لئن شكرتم لاذيدنكم
increase this blessing manifold.
Ma’asir Hakeemul Ummat ra, page 485