There are a lot of bad countries to be born into, I mean just look up the countries with the top number of births.
Also, reincarnation might not be limited to humans… lots of factory farm animals out there for you to be reincarnated as… 👀
Honestly its one of the reasons I wanna live this life as long as I can, I wanna delay being in Afganistan, or North Korea, or a mouse that gets killed by the housecat, or being a damn cockroach.
If you liked that blurp and want more, Exurb1a wrote several (vaguely connected) books on the matter. I cannot tell you anything more without spoiling it.
The Fifth Science, The Prince of Milk, Geometry for Ocelots, Logic Beach: Part I