When I think about what I would do if I suddenly found myself transported to another world, the last thing I would be doing is looking for a job as a mercenary. As stupid as a lot of the plot is, I really like Striving for a Luxury Liner simply because the MC recognizes that he's not cut out to be an adventurer and becomes a merchant instead.

The only isekai I've read that properly utilized the isekai genre was Release that Witch since the MC's "cheat" is his knowledge of mechanical engineering. He kicks off his own little industrial revolution to defend his territory.