You realize if you maintain your definition of world as all humanity, then according to 1 John 5:19 all Christians are under the control of the evil one. Is this your claim? Are Christians under the control of the evil one?
No, again context.
Humanity in general, the world, of all humanity but especially believers as the special object of God's love, eg, John 3:16, 17c, 6:33, 51, 12:47b, et
The
system of human existence (worldly ways) in its many aspects,
the world, ... (b) the world , and all that belongs to it, appears as that which is hostile to God, ie, lost in sin, wholly at odds with anything divine, ruined and depraved, eg, 1 John 5:4, 2:17, etc.
"worldly affairs; the aggregate of things earthly; the whole circle of earthly goods, endowments, riches, advantages, pleasures, etc., which, although hollow and frail and fleeting, stir desire, seduce from God and are obstacles to the cause of Christ":
Galatians 6:14;
1 John 2:16;
1 John 3:17; εἶναι ἐκ τοῦ κόσμου, to be of earthly origin and nature,
https://biblehub.com/greek/2889.htm