If you focus on the protagonist's life before the isekai for a notable period of time you either aim to:
A) Establish what the life before being transmigrated was with friends, and family, and coworkers or classmates, and so on.
B) Establish the protagonist relevant proficiencies
C) Establish how the whole transmigration process works
D) All of the above
I suspect at least one is true, isn't it?
Problem is:
A) The dull and endless day of work or school is what the audience wants to escape from. Entire escapism venue is ruined. The family to return to, the life to return to, the wife, children, friends. There is an only way for the story to progress, and that's trying to get back. Even if it fails, it will constantly distract from the shiny and new of the otherworld. Alternatively, a new otherworld would just seem like the pointless torture porn if it is any worse than the previous, making the escapism seeking audience even more depressed. Petty rivalry between classmates and colleagues makes the escape venue just even more tiresome.
B) The desperate attempt to create the protagonist's competence for the wild fantasy world would also create the "genius!engineer!marine!delta force!commando!martial artist!protagonist" which would be either ridiculous, or, if slightly more realistic, burden the story with the real world politics and issues. Now you have rivals because of politics. They might not be petty (though it depends) but they are certainly not fun.
C) A well-established transmigration process means it could be and will be reversed. The escapism would be completely invalidated, world would be the dream to teach the protagonist (and audience) a lesson they didn't want. In best case scenario, it would just alienate them, turning the entire story into the allegory like Narnia, or it would be some variation in the "genie wish logic". In worse case scenario, if mixed with B, would just allow for the real-world issues to bleed over, making it less fantastical...
Considering you mention "isekaiizer" implying the device I suspect you go for the Narnia route ...
Lion Jesus rewards you for your services to send you back to being a starving child in the middle of the Nazi bombing raid.
That...is an option, yes.
What is your target audience for that? On the Scribble Hub?
There are, of course, alternatives, but I don't read you as the GATE fan. But who knows...