In order for us to provide better support, we need to see the log generated by Citra. This guide will walk you through how you can obtain the log file: How to Upload the Log File.
If I remember correctly, Citra’s devs stated that some cheats might not work because the way Citra process them is different to an actuall 3DS.
Anyways, if a game doesn’t in that Github, you can search the game’s ID on Google, and the cheats can appear elsewhere.