Forget about his old home country, it pretty much betrayed him, but he maybe should have started anew by only using his first name and not telling everything about himself to anyone asking. Start from scratch as a new man, that is. With people knowing who and what he is, they are going to try to use him. But then again, he was super happy to serve the Basam house in the past, so maybe he actually loves to serve someone till the end of his days. Might be his old Japanese salaryman mentality. For the Japanese salarymen, their employer is their life, lover, god, family, and everything. If that's what he wants, he should go for it. Personally I prefer the more gamer types of MCs who treat the isekai more like a gaming challenge and thus won't easily accept shit from anyone, rather they want to see what the world has got to offer and be in control of their own lives.This doesn't seem like the smartest move.
He went and inform another country, one that his unicorn said mistreated it, and spilled the weak state of his previous country.
I get that he may be trying to prevent a civil war in the country by making this other country bring order, but it still does seem like a weird move