I loved the Sharpe series too. I've also really liked all of Bernard Cornwell's novels that I have read, and have watched "The Last Kingdom" which is a tv adaptation of his novels about Britain in the days of Alfred the Great.
If you liked the Sharpe series, you might want to check out the
Recollections of Rifleman Harris, a first-person account of a soldier in the same regiment as Plunkett, who served in the Peninsula Campaign as well as other places. Apologies if you are already familiar with it.
It's a very interesting and engaging account of the life of a common soldier of the time. Some may have thought of them as "the scum of the earth," but Rifleman Harris was the "regular Joe" of his day and I appreciated reading his memoir.
https://en.wikipedia.org/wiki/The_Recollections_of_Rifleman_Harris
https://www.amazon.com/Recollections-Rifleman-Harris-Benjamin/dp/1515419460/ref=tmm_pap_swatch_0?_encoding=UTF8&qid=&sr=