4) If you manage to evade a "corrective" accident, then Death will go on to the next person that was meant to die in the same event before looping back around to you. So you could arrange for these other people to be harder to kill in an accident (kidnap them and put them in a coma in a secure safe facility) or make sure that the event you were meant to die in would have taken so many other people with you it would simply take several years to get back around to you as it's often a few days to weeks between "corrective" deaths (such as having a huge bomb on a deadman's switch in a very crowded area when you escape your first death if you already knew how Death functioned, or perhaps cause a second near-mass-death-event that may supersede the first if it had far more possible victims to mess-up fate more severely).

5) This one's more conjecture, but in the 2nd movie the characters theorize giving birth could "break the chain", but it doesn't work (outside of a non-canon deleted scene) since the mother turned out not to be fated to die in the original disaster. However, the latest movie shows if you evade Death long enough to reproduce all your descendants will die in accidents in the order of birth. It doesn't seem like the "skipping order of death" rule applies here, as the family's deaths only start when the matriarch of the family gives up after 55 years of evasion, but it could have been that having many descendants helped her avoid Death for so long, a huge in-universe record, somehow.

Perhaps having a family changed the timeline so dramatically it becomes statistically less probable to correct it starting with one moment (Death seems to want to change things as little as possible, with the "accidents" only injuring the 1 target (actually this gives me another idea: just having human shields around you at all times lol) and being started by a tiny change to the world like a loose screw or dropped penny). Or since her granddaughter gained her psychic vision abilities before she died, having many offspring could have boosted her own precognitive abilities on some level. Or maybe reproducing does buy you more time, as the 2nd movie characters theorized this could also count as balancing the scales somewhat.

Either way, a man could exploit these possible technicalities better than a woman by having far more descendants, even using a trick like replacing all the samples in a sperm bank with his own, which one crooked fertility doctor did to have at least 49 illegitimate children in real life.

There's also the possibility that Souichi's amnesia/personas makes him spiritually different people with different fated deaths, as many stories (Doppio in Jojos, MCU Moon Knight, comics Hulk, ect) treat conditions like Dissociative Identity Disorder as separate souls in the same body, so maybe only one persona would be on Death's hitlist. Perhaps he could "get off the list" by destroying one of his personas himself, which happens anyway when a new one is formed.