Hello, I'm also scouring for more books with this trope, and found these:

https://www.novelupdates.info/series/i-really-am-not-the-lord-of-demon/       - has a lot of similarities with 'I'm Really Not the Demon God's Lackey'

https://www.novelupdates.info/series/im-the-slit-eyed-character-at-the-academy-but-im-not-the-mastermind/

https://www.novelupdates.info/series/otherworld-trpg-game-master/

https://www.novelupdates.info/series/cant-escape-from-the-villainous-corporation/        - I think the misunderstandings here are similar to 'Got Dropped in a Horror Story'...?

https://www.novelupdates.info/series/forget-management-i-just-want-to-spend-money/        - modern world

https://www.novelupdates.info/series/i-accidentally-created-a-villainous-organization/

https://www.novelupdates.info/series/how-the-cult-saves-the-world/         

https://www.novelupdates.info/series/i-rely-on-drawing-cards-to-set-up-a-persona/         - this one is BL. It has quite a similar premise to "Guide for Background Characters to Survive"

Have a great day!

@If_It_Fits_It_Ships Thanks a lot for your reply! Will go through these. 
If I come across any others, I'll ping them here