en_tn/1jn/05/04.md

everyone

This refers to all children of God.

overcomes the world

This can be translated “refuses to do the evil things unbelievers do”

And this is the victory…our faith

This could be translated "Our faith gives us the power to resist sinning against God."

Who is he who overcomes the world?

This is a rhetorical question which contains a metonymy (world). "He" refers to believers. (See: rc://en/ta/man/translate/figs-rquestion and rc://en/ta/man/translate/figs-metonymy)