Waalaikum assalam! Wah, 14 jam in labour room memang penat, tahniah on being so prepared despite the long ordeal, and I hope this time goes smoother for you. A few of us mums here swear by staying upright and mobile during labour (squatting, walking, using the birthing ball) rather than lying down, my friend who did her second baby this way said the contractions felt more productive and baby came faster. Definitely continue with your perineum massage and exercises since you're already disciplined with that, and maybe add more frequent position changes during labour itself; also, don't hesitate to ask the hospital staff to let you move around the ward freely if they allow it. And of course, your doa and faith played a huge part, trust that this time can be different, setiap kehamilan lain-lain. Best wishes for a smooth delivery!