In a retake, you're typically outnumbered or outpositioned. The Ts have time, position, and likely utility. The math says you lose individual duels.
Solution: don't fight individual duels. Make sure every CT death produces a trade. If T1 kills CT1, T1 should be dying to CT2 within 2 seconds. The 1-for-1 trade chain is the only way retake math works.
Practical: peek angles your teammates can see. If you're going alone into a 4-T bomb stack, you're already dead. Wait, smoke off, push together with utility.
Common retake mistake: pushing the most-distant angle alone. The trade chain breaks because no one can hear / see / shoot the trader.