How does one get rid of the feelings of sadness and being weighed down by the long path of seeking God's pleasure, and striving in daily acts of obedience such as waking up for Fajr prayer, and abandoning what the self desires that displeases God?

Deliverance from feelings of spiritual sluggishness is achieved by remembering Allah's companionship and His help for whoever desires to draw closer to Him, by fleeing to Him, by sincerely and truthfully asking Him for success, by accompanying good people, by studying the biographies of the righteous, by persistent striving, by sincere seeking, and by complete devotion to Allah the Almighty. Whenever a servant is truthful and strives against his own self, the path becomes easy for him and becomes a source of comfort.