Worship performed solely through fear will cease once hope enters the heart. The way to worship Allaah is with love, fear and hope as Ibn al Qayyim (رحمه الله) said:
“The heart in its journey towards Allah, is like a bird whose head is love, and hope and fear are its two wings. When the head and the two wings are sound and healthy, the flight of the bird is good, but when the head is cut off, it immediately dies, and when either or both wings are deficient, the bird cannot properly fly and may become victim of any hunter or snare.” [Madaarij Al-Salikeen]
When you really love Allaah, the actions that please Him, will never bore you.
[A saying of Akh Hadi Hammad of Muwahidoon. NB: Not quoted exactly, rather through meaning]