Okay, this needs some looking into.
The Greek word used in Jn 15:13 is psuche, meaning "breath; the breath of life; the soul."
Among others, the NT uses it of
1) the life of the body - Mt 2:20; Lk 12:22; Ac 20:10, etc.,
2) the immaterial, invisible part of man - Mt 10:28; Ac 2:27,
3) the disembodied ("unclothed" or "naked) man - 2Co 5:3, 4; Rev 6:9,
4) the seat of personality - Lk 9:24 ("own self" in v.25); Heb 6:19, 10:39, etc.
5) the seat of the sentient, by which one perceives, reflects, feels, desires - Mt 11:29; Lk 1:46, 2:35; Ac14:2, 22,
6) the seat of will and purpose - Mt 22:37; Ac 4:32; Eph 6:6; Php 1:27; Heb 12:3,
7) persons, individuals - Ac 2:41, 43; Ro 2:9; Jas 5:20; 1Pe 3:20; 2Pe 2:14,
8) the equivalent of the personal pronoun - Jn 10:24 ("us"); 2Co 12:15 ("you"), 2Pe 2:8 ("them"), etc.,
9) an animate creature, human or other - 1Co 15:45; Rev 16:3,
10) the "inward man," the seat of new life - Lk 21:19; Mt 10:39; 1Pe 2:11; 3Jn 2
The meaning of Jn 15:13 is #1, not #10.
We see that illustrated in Ro 9:1-3, where Paul states "he could wish" to give up his salvation
for the sake of those of his own race.
Paul says "I could wish," not "I do wish," because it is impossible to give up one's salvation.
So Jn 15:3 does not state that we should be willing to give up our salvation for anyone.
It's talking about giving up one's life, not one's salvation.