Tate no Yuusha no Nariagari, Arifureta Shokugyou de Sekai Saikyou Recommendations
In both titles main character is a guy who is dragged into another realm and has to finish certain quest in order to get back to his world. What's special about these two isekai animes is that main character starts as somebody seen as weaker compared to other people who were dragged into another realm. That results in constant laugh at him from his fellow comrades, or even discrimination. In both cases our main heroes are getting stronger as fast as it is possible, to the moment they are overpowered and the others have to change their opinions on them. Their adventures also depict how
Both have that character plot where the MC started out as a low level participant, to find himself in some shitty situation that has almost drive him insane to a hero who has proven himself in a highest level that even his supposed comrades were green with envy.
Both main character was teleported in another world where they will be heroes, both was weak and betrayed, and both of them became stronger.
Both MC are being betrayed. Both snap and don't care about being nice anymore. Both unusual class (Tate no Yuusha: Shield - Arifureta: Crafting).
Also both have a young female traveling companion, who are quite inclined towards MC.
Both main characters were betrayed and seemed weak at the start of the series.
They both got op.
Both MCs started travelling with an abandoned girl (+more)
Both are about the main character being isekai'd to another world along with other people where he is seen as the weakest, he gains powers and becomes strongest. Both also are joined early on by abandoned loli.
Yo u can find betrayal in both of them, Arifureta is a lil bit more edgy tho,also lets not forget about the girls and that the mc is op.