There are countless manga that start like this one... "I got kicked from my party, I was actually op, got a harem, now I am chad, etc".
And this one is not bad, I've seen worse, but is also not good, it's something way worse, it's extremely generic, boring and way too predictable. In general the story is just the generic nice guy, that gets power and a harem just because he is a "nice guy", feels like a wet dream from someone that has never interacted with other people.