Kindly refer to the following links:
How to stay on track after Ramadan? (Peak & Downfall of Iman)
How to stay steadfast on the deen & remain on Islam?
How to protect ourselves from indulging in Duniya? how to be steadfast
I keep repeating sins even after repenting, what should I do? (audio has an echo, apologies)
How can a person maintain high level of iman throughout his life? fearing hypocrisy