How can one avert one's gaze from beholding Allah Almighty morning and evening, which is the greatest bliss, to other blessings such as houris and palaces?

The hadith indicating that some believers will see their Lord morning and evening is not authentic. As for how a believer will patiently endure seeing the face of Allah at certain times and not others, this is a matter of the unseen which we do not know. However, a believer will not suffer in Paradise; they will not feel deprivation or sadness, for Paradise is a abode of bliss, not hardship. Allah says: "No fatigue will touch them therein, nor from it will they ever be expelled" (Al-Hijr: 48), and "He who has settled us in the home of lasting residence from His bounty. No fatigue will touch us therein, nor will exhaustion touch us therein" (Fatir: 35). The believer in Paradise will not experience feelings of deprivation or sadness. What is most important is to strive for how to enter Paradise.