I was going to say that this is typical shonen tripe aimed at chuuni middle schoolers who want power fantasies and obvious cardboard villains with no depth or nuance, but the listed demographic is seinen so I've got nothing. This is just shallow, cliched writing.
Typical shonen only has curb stomp battles when introducing the new top-tier villain, but after that it's more about long relatively even battles that are fueled by determination and friendship. Or at least the classic type of shonen action.
I do wish that just once one of these "Everyone thought I was weak but I wasn't" stories would a) make the protagonist strong enough to be self-sufficient but not just able to wipe the floor with everyone he encounters.
The closest to that I can think of is either
Only Sense Online, which is a game so it matters less, but he's at least only powerful when it comes to his actual niche specialties, rather than at absolutely everything, or
Saijaku Teima wa Gomi Hiroi no Tabi wo Hajimemashita which has an actually weak tamer girl who gets by with the help of others and doing low-level tasks.
b) make the hero party or whoever kicks him out not be unrepentant, obvious dickhead trashbag people. Like they don't have to be concerned and all "we're doing this for your own good" earnestly, but at least make it so that the remaining hero isn't the world's sleaziest asshole who constantly gloats about cutting out the "weak" protag and then blaming said protag when everything goes sideways for him.
I have seen that a few times, but not in any manga I care to name. An alternative that's more common is like in
Shin no Nakama janai to Yuusha no Party wo Oidasareta node, Henkyou de Slow Life suru Koto ni shimashita where it's only one dickhead in the party who kicks MC out (usually the "hero") and the rest of them just don't argue enough, are controlled, or are otherwise ineffective at changing the outcome. Those can also be somewhat redeemable.
I still read this because I like the MC and his party when they're not actively engaged in curb-stomp battles, but it's kind of an "I'm reading this in spite of the parts I don't like" follow from me.
There are a bunch of manga with aspects I don't like, but there are other parts I like enough to spend the few minutes per week/month it takes to read them. If I just read manga I liked everything about I'd run out before I started.