There is no shame in admitting defeat. Learn to surrender.
Seriously. When the enemy team has 30 kills above yours, your entire team is getting one-shot under towers repeatedly and nobody can even farm, much less defend their turrets from being taken down, its okay to surrender. "Ride it out" "just farm and back off" "we can scale" is stubborn fanaticism at this point. When the enemy team is clearly superior in every possible way its okay to surrender and try again in the next match.