Cheats are tied to a specific version of a game. If your game updates, the old cheat code might not work because the has changed. Open Ryujinx. Right-click your game in the list. Select Extract Data > ExeFS .
Since Ryujinx uses the Atmosphere format, you can source codes from major Switch modding communities. Popular databases include: atmosphere cheats ryujinx
Open your cheats.txt and paste your codes. A standard Atmosphere cheat looks like this: [Infinite Gold] 04000000 01234567 000003E7 Use code with caution. Cheats are tied to a specific version of a game