The historical tidbits, while very fascinating don’t really help our aspiring author.
The bottom line is today, in 2021/5781 Talmudic literature in languages other than Hebrew are not perceived as being serious.
Similarly comments that it shouldn’t be this way are similarly useless. I don’t think the author plans to singlehandedly change the current perception.
His question is simple how to sell books.
Comments that well once upon a time they would have been more mainstream or people should get over themselves and accept emes in any language, while true , aren’t helpful .
bottom line. it is unlikely to become popular* among “many top yungerliet who are alumni of prestigious yeshivos” (their loss)
I think you will find more success marketing it to “non-top” bochurim and yungelit who are struggling a bit
and/or
People out of yeshiva as a reminder to the lomdus they once appreciated back in the day. “Relive the glory days of yeshiva ” or something like that
*certainly not openly