en_tn/ecc/02/09.md

than all who were before me in Jerusalem

This refers to all the previous rulers of Jerusalem. Alternate translation: "than all the kings who had ruled before me in Jerusalem" (See: rc://en/ta/man/jit/figs-explicit)

my wisdom remained with me

This is an idiom. "I continued to act wisely" or "I continued to be wise" (See: rc://en/ta/man/jit/figs-idiom)