You will find a detailed answer to this question in the book "Weakness of Faith", under “Shaykh’s books” on this website. And Allah is the Source of help.
Strengthening One’s Eemaan (Faith)
Question 3172
Are there any suggestions you have to strengthen one's iman?
Answer
Praise be to Allah, and blessings and peace be upon the Messenger of Allah:
training oneself
Source:
Islam Q&A
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