I'm not sure where you're going with this massive generalized complaint, but Harris has absolutely nothing to do with "nepotism" or meritless elevation to the candidacy for President. Just because she's a woman of color, doesn't make her a charity hire, as has been suggested around here. She's intelligent, accomplished, and with years of public service on her resume. On the other hand, both Trump and Vance are mainly qualified because they are white men. But that never seems to bother anyone.
As to solving mass migration, I'm pretty sure it wouldn't happen in an afternoon, no matter how much will and power you apply. I can't speak to the problem in every country, but in the US, the problem was decades in the making, if not more, complicated by such things as lack of reciprocal deportation agreements between us and certain other countries.