There are several ways you can motivate and wake up the sleeping giant in you, but I have thoughtfully crafted this that I believe is useful for all times.
Refresh your old memories that bring sweet feelings. Although this seems simple, you have to recollect all of the good feelings you had in the past.
Old memories of your accomplishments, successes, and breakthroughs can ignite the fire and resurrect the passion you once had.
Such memories can be a successful pass of a graduate or any school examination, your first job, your first paycheck, etc. Such memories often trigger passion and strong desires that can motivate you and push you towards your goal.
If you have lost the desire to pray, remember how God answered your prayers in the past. Remember how you pray regularly and the results of the prayers. Remember how you were zealous for God. This may likely kindle the fire to wake you up from your slumber.
Recollect your old memories and let them ignite the fire within you by waking up the sleeping giant.