Kindly refer to the following links:
My emaan drop low, how to increase it?
Sheikh Assim Al-Hakeem: repentance and fighting satan
Ashamed to repent because I keep sinning
When you choose the Quran and Sunnah over your own whims and desires
Advice on how to fight the desire to sin
Finding it difficult to practice islam, lazy to pray & read Quran, please advise -
Used to be good in prayers but now feel lazy & lack concentration, how to fix this?