Ways to Steadfast Faith

Quran
Adhering to the Laws of Allah SWT
Following Examples from the Stories of the Prophets AS
Duaa
Remembrance of Allah SWT
Striving to Follow the Correct Way (methodology)
Training and Education
Being Confident in the Road You are Following
Calling Others to Allah SWT
Keeping Company of People who'll help you be Steadfast
Being Confident of Allah SWT's help and Future Glory of Islam
Understanding the Reality of Falsehood and not being mislead by it
Developing Sabr
Advice of Righteous Men (to boost your self-confidence, passion)
Thinking about the Delights of Paradise and Torments of Hell

- Extracted from Salih Al-Munajjid's Book

Salaam

AsSalaamuAlaikumWaRahmatullahiWaBarakatuhu!