The last 10 days of Ramadan are the most blessed & we should increase our Worship & Devotion:

"Allah's Messenger used to exert himself in devotion during the last ten nights to a greater extent than at any other time." (Muslim).

"Aisha (Ra) reported: With the start of the last ten days of Ramadan, the Prophet (Sallallahu Alaihi Wasallam) used to tighten his waist belt (i.e. work harder) and used to pray the whole night, & used to keep his family awake for the prayers" (Bukhari)