Read your Bible

Set aside time and pray.

Attending a religious small group and participating.

Listen to a sermon, lecture, or informative podcast about some aspect of faith.

Take one day and fast so that you have more time for God.

Read a book that stretches your faith.

Invite a mature Christian to coffee or lunch and pick their brain.

Volunteer to teach, lead, or serve in some new capacity.

Go on a mission trip.

Find someone and intentionally share Jesus with them.

(Repeat)

It is highly unlikely that you did not know the tools mentioned above. There are no new tricks or techniques to grow spiritually. You need to keep doing the same things over and over, and eventually, you will become more like Jesus. Growth comes from not only knowing what to do but by doing it.