The hard times you and I face will be unique. No two lives are exactly the same. Trials are suited to each of us by a loving Heavenly Father and His Beloved Son, Jesus Christ. The way in which They respond to our prayers for help will be whatever is best for us. For some it may be to strengthen us, and for others it may be to give us joy as we struggle on in faith. For all of us, the help we need most as we are tested, in whatever ways and for however long, is a vibrant faith in Jesus Christ.
President Henry B. Eyring, "God Can Help Us in Hard ", Liahona, March 2022
For years, I've tried to figure what faith is and how I could strengthen it. I spent many hours on my mission pondering those questions.
Faith is so much more than just believing in the existence of Jesus Christ, it is living how He would live. Faith is so much more than knowing the gospel is true, it is living the commandments of God.
To strengthen faith, we need to act more. Do more of the things Christ would do. Help others more. Study the scriptures more. Pray more.
Now....I don't mean to spend more time doing those things, we all need more than 24 hours in a day as it is. I mean to do those things with more Christlike attitudes. Do it for Him more and for ourselves less. Do it for His love and help and not to fulfill some responsibility or commitment. Although reaching some goal to read scriptures every day, for example, is beneficial... communing with God and Christ is more beneficial.
That will strengthen our faith, and testimony.