The best thing you can do is to avoid the things that increase your risk of PPH (like being induced), make sure the room after birth is kept dimly lit and quiet and relaxed, and consider having a managed 3rd stage.
Induction with synthetic oxytocin (pitocin) increases the risk of PPH by 80%. So if you can avoid anything that starts or augments your labour, have a natural, spontaneous birth with few interventions, that will greatly decrease the chances of another PPH. What prevents PPH is your uterus being able to effectively contract, sheer off the placenta, and then contract down closing off the blood flood from the uterine wall at the site where the placenta had attached. This needs oxytocin to happen and oxytocin being a love hormone flows best when the room is dark, quiet, you're relaxed, there aren't a million people flapping about in a panic, and when it isn't already overly tired. Induction causes the uterus to contract unnaturally hard during labour, so by the time to get to the 3rd stage, you can get some atony, which is basically when the muscles of the uterus are so tired, they can't contract when they are supposed to, so if you start to bleed, they can't stop it. Avoiding induction means you avoid the risk of uterine atony just because your uterus has contracted too hard during labour. Further, if you can request that after baby is born that the lights are kept low (just enough for them to see what's going on), people stay quiet, you have skin to skin or even latch baby on for a feed if you plan to BF, whatever it takes for you to feel relaxed and for the room to be calm and quiet and dark.
Beyond that, if you haven't opted to have a managed 3rd stage already, that would be something I'd consider. In a normal, spontaneous, natural birth with no interventions, it's often best just to leave things to happen on their own. Your body will produce the hormones in the right balance to contract down the uterus and stop any bleeding, if all else is well. So if you have a totally natural intervention-free birth, it might be best just to leave it and let your body do it. But if it hasn't been intervention free or for added peace of mind, management of the 3rd stage can reduce blood loos and prevent a PPH. I'm assuming they would have encouraged you to opt for one last time as well, but if not, I'd consider going this route too.